XAResourceRecoveryImpl does not consider the possibility that wrapXAResource may be null

This results in a potential problem when deploying XML datasources in AS7 without an xa-pool:

14:17:30,697 WARN [com.arjuna.ats.jta] (Periodic Recovery) ARJUNA016009: Caught:: java.lang.NullPointerException
at org.jboss.jca.core.tx.jbossts.XAResourceRecoveryImpl.getXAResources(XAResourceRecoveryImpl.java:187)
at com.arjuna.ats.internal.jbossatx.jta.XAResourceRecoveryHelperWrapper.getXAResources(XAResourceRecoveryHelperWrapper.java:52) [jbossjts-integration-4.16.1.Final.jar:]
at com.arjuna.ats.internal.jta.recovery.arjunacore.XARecoveryModule.resourceInitiatedRecoveryForRecoveryHelpers(XARecoveryModule.java:462) [jbossjts-4.16.1.Final.jar:]
at com.arjuna.ats.internal.jta.recovery.arjunacore.XARecoveryModule.bottomUpRecovery(XARecoveryModule.java:385) [jbossjts-4.16.1.Final.jar:]
at com.arjuna.ats.internal.jta.recovery.arjunacore.XARecoveryModule.periodicWorkSecondPass(XARecoveryModule.java:166) [jbossjts-4.16.1.Final.jar:]
at com.arjuna.ats.internal.arjuna.recovery.PeriodicRecovery.doWorkInternal(PeriodicRecovery.java:789) [jbossjts-4.16.1.Final.jar:]
at com.arjuna.ats.internal.arjuna.recovery.PeriodicRecovery.run(PeriodicRecovery.java:371) [jbossjts-4.16.1.Final.jar:]

I am just going to work around this in AS7 for now, but I think this should still be fixed in IJ.