Error upgrading from RHDM 7.2.1 to 7.3.0 using migration tool rhdm-7.3.0-update

While trying to update RHDM from RHDM 7.2.1 to 7.3.0 using migration tool rhdm-7.3.0-update (./apply-updates.sh), if any of the standalone-*.xml doesn't contain " <system-properties>" tag then it's throwing null pointer exception.

~~~
./apply-updates.sh <jboss-home>/standalone/deployments/decision-central.war rhdm-decision-central-eap7-deployable
~~~

Exception Thrown
---------------------
~~~
20:15:06.699 [main] ERROR - Unexpected error occurred. Please contact Red Hat Support if you think this is a bug in the updating tool itself.
java.lang.NullPointerException: null
at org.jboss.brmsbpmsuite.patching.systemproperty.SystemPropertyLoader.load(SystemPropertyLoader.java:14)
at org.jboss.brmsbpmsuite.patching.systemproperty.SystemPropertyPatcher.<init>(SystemPropertyPatcher.java:21)
at org.jboss.brmsbpmsuite.patching.client.ConfigurationPatcher.applyPatch(ConfigurationPatcher.java:71)
at org.jboss.brmsbpmsuite.patching.client.ConfigurationPatcher.apply(ConfigurationPatcher.java:43)
at org.jboss.brmsbpmsuite.patching.client.ClientPatcherRunner.runConfigPatcher(ClientPatcherRunner.java:120)
at org.jboss.brmsbpmsuite.patching.client.ClientPatcherRunner.run(ClientPatcherRunner.java:32)
at org.jboss.brmsbpmsuite.patching.client.ClientPatcherApp.commonMain(ClientPatcherApp.java:52)
at org.jboss.brmsbpmsuite.patching.client.BRMSClientPatcherApp.main(BRMSClientPatcherApp.java:6)
~~~