Dropping SAR subsystem and SAR extension in a batch results in

```
15:36:09,805 ERROR [org.jboss.as.controller.management-operation] (management-handler-thread - 2) WFLYCTL0013: Operation ("remove") failed - address: ([("subsystem" => "sar")]): java.lang.NullPointerException
at org.jboss.as.controller.CapabilityRegistry.getCapabilitiesForAddress(CapabilityRegistry.java:469)
at org.jboss.as.controller.CapabilityRegistry.capabilityReloadRequired(CapabilityRegistry.java:446)
at org.jboss.as.controller.AbstractOperationContext.reloadRequired(AbstractOperationContext.java:1122)
at org.jboss.as.controller.ReloadRequiredRemoveStepHandler.performRuntime(ReloadRequiredRemoveStepHandler.java:56)
at org.jboss.as.controller.AbstractRemoveStepHandler$1.execute(AbstractRemoveStepHandler.java:82)
at org.jboss.as.controller.AbstractOperationContext.executeStep(AbstractOperationContext.java:980)
at org.jboss.as.controller.AbstractOperationContext.processStages(AbstractOperationContext.java:726)
at org.jboss.as.controller.AbstractOperationContext.executeOperation(AbstractOperationContext.java:450)
at org.jboss.as.controller.OperationContextImpl.executeOperation(OperationContextImpl.java:1402)
at org.jboss.as.controller.ModelControllerImpl.internalExecute(ModelControllerImpl.java:418)
at org.jboss.as.controller.ModelControllerImpl.lambda$execute$1(ModelControllerImpl.java:243)
at org.wildfly.security.auth.server.SecurityIdentity.runAs(SecurityIdentity.java:263)
at org.wildfly.security.auth.server.SecurityIdentity.runAs(SecurityIdentity.java:229)
at org.jboss.as.controller.ModelControllerImpl.execute(ModelControllerImpl.java:243)
at org.jboss.as.controller.remote.ModelControllerClientOperationHandler$ExecuteRequestHandler.doExecute(ModelControllerClientOperationHandler.java:217)
at org.jboss.as.controller.remote.ModelControllerClientOperationHandler$ExecuteRequestHandler.access$400(ModelControllerClientOperationHandler.java:137)
at org.jboss.as.controller.remote.ModelControllerClientOperationHandler$ExecuteRequestHandler$1$1.run(ModelControllerClientOperationHandler.java:161)
at org.jboss.as.controller.remote.ModelControllerClientOperationHandler$ExecuteRequestHandler$1$1.run(ModelControllerClientOperationHandler.java:157)
at org.wildfly.security.auth.server.SecurityIdentity.runAs(SecurityIdentity.java:287)
at org.wildfly.security.auth.server.SecurityIdentity.runAs(SecurityIdentity.java:244)
at org.jboss.as.controller.AccessAuditContext.doAs(AccessAuditContext.java:254)
at org.jboss.as.controller.AccessAuditContext.doAs(AccessAuditContext.java:225)
at org.jboss.as.controller.remote.ModelControllerClientOperationHandler$ExecuteRequestHandler$1.execute(ModelControllerClientOperationHandler.java:157)
at org.jboss.as.protocol.mgmt.ManagementRequestContextImpl$1.doExecute(ManagementRequestContextImpl.java:70)
at org.jboss.as.protocol.mgmt.ManagementRequestContextImpl$AsyncTaskRunner.run(ManagementRequestContextImpl.java:160)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
at org.jboss.threads.JBossThread.run(JBossThread.java:320)

15:36:09,807 ERROR [org.jboss.as.controller.management-operation] (management-handler-thread - 2) WFLYCTL0190: Step handler org.jboss.as.controller.extension.ExtensionRemoveHandler@3ca42854 for operation remove at address [("extension" => "org.jboss.as.sar")] failed handling operation rollback – java.lang.IllegalStateException: WFLYCTL0363: Capability 'org.wildfly.sar-deployment' is already registered in context 'global'.: java.lang.IllegalStateException: WFLYCTL0363: Capability 'org.wildfly.sar-deployment' is already registered in context 'global'.
at org.jboss.as.controller.CapabilityRegistry.lambda$registerPossibleCapability$0(CapabilityRegistry.java:572)
at java.util.concurrent.ConcurrentHashMap.computeIfPresent(ConcurrentHashMap.java:1769)
at org.jboss.as.controller.CapabilityRegistry.registerPossibleCapability(CapabilityRegistry.java:566)
at org.jboss.as.controller.registry.ConcreteResourceRegistration.registerCapability(ConcreteResourceRegistration.java:684)
at org.jboss.as.controller.SimpleResourceDefinition.registerCapabilities(SimpleResourceDefinition.java:362)
at org.jboss.as.controller.registry.NodeSubregistry.registerChild(NodeSubregistry.java:112)
at org.jboss.as.controller.registry.ConcreteResourceRegistration.registerSubModel(ConcreteResourceRegistration.java:231)
at org.jboss.as.controller.extension.ExtensionRegistry$SubsystemRegistrationImpl.registerSubsystemModel(ExtensionRegistry.java:706)
at org.jboss.as.service.SarExtension.initialize(SarExtension.java:93)
at org.jboss.as.controller.extension.ExtensionAddHandler.initializeExtension(ExtensionAddHandler.java:131)
at org.jboss.as.controller.extension.ExtensionRemoveHandler$1.handleRollback(ExtensionRemoveHandler.java:81)
at org.jboss.as.controller.AbstractOperationContext$RollbackDelegatingResultHandler.handleResult(AbstractOperationContext.java:1526)
at org.jboss.as.controller.AbstractOperationContext$Step.invokeResultHandler(AbstractOperationContext.java:1498)
at org.jboss.as.controller.AbstractOperationContext$Step.handleResult(AbstractOperationContext.java:1480)
at org.jboss.as.controller.AbstractOperationContext$Step.finalizeInternal(AbstractOperationContext.java:1437)
at org.jboss.as.controller.AbstractOperationContext$Step.finalizeStep(AbstractOperationContext.java:1420)
at org.jboss.as.controller.AbstractOperationContext$Step.access$400(AbstractOperationContext.java:1284)
at org.jboss.as.controller.AbstractOperationContext.executeResultHandlerPhase(AbstractOperationContext.java:857)
at org.jboss.as.controller.AbstractOperationContext.processStages(AbstractOperationContext.java:739)
at org.jboss.as.controller.AbstractOperationContext.executeOperation(AbstractOperationContext.java:450)
at org.jboss.as.controller.OperationContextImpl.executeOperation(OperationContextImpl.java:1402)
at org.jboss.as.controller.ModelControllerImpl.internalExecute(ModelControllerImpl.java:418)
at org.jboss.as.controller.ModelControllerImpl.lambda$execute$1(ModelControllerImpl.java:243)
at org.wildfly.security.auth.server.SecurityIdentity.runAs(SecurityIdentity.java:263)
at org.wildfly.security.auth.server.SecurityIdentity.runAs(SecurityIdentity.java:229)
at org.jboss.as.controller.ModelControllerImpl.execute(ModelControllerImpl.java:243)
at org.jboss.as.controller.remote.ModelControllerClientOperationHandler$ExecuteRequestHandler.doExecute(ModelControllerClientOperationHandler.java:217)
at org.jboss.as.controller.remote.ModelControllerClientOperationHandler$ExecuteRequestHandler.access$400(ModelControllerClientOperationHandler.java:137)
at org.jboss.as.controller.remote.ModelControllerClientOperationHandler$ExecuteRequestHandler$1$1.run(ModelControllerClientOperationHandler.java:161)
at org.jboss.as.controller.remote.ModelControllerClientOperationHandler$ExecuteRequestHandler$1$1.run(ModelControllerClientOperationHandler.java:157)
at org.wildfly.security.auth.server.SecurityIdentity.runAs(SecurityIdentity.java:287)
at org.wildfly.security.auth.server.SecurityIdentity.runAs(SecurityIdentity.java:244)
at org.jboss.as.controller.AccessAuditContext.doAs(AccessAuditContext.java:254)
at org.jboss.as.controller.AccessAuditContext.doAs(AccessAuditContext.java:225)
at org.jboss.as.controller.remote.ModelControllerClientOperationHandler$ExecuteRequestHandler$1.execute(ModelControllerClientOperationHandler.java:157)
at org.jboss.as.protocol.mgmt.ManagementRequestContextImpl$1.doExecute(ManagementRequestContextImpl.java:70)
at org.jboss.as.protocol.mgmt.ManagementRequestContextImpl$AsyncTaskRunner.run(ManagementRequestContextImpl.java:160)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
at org.jboss.threads.JBossThread.run(JBossThread.java:320)
```