NPE during validation of Controller Service that relies on another Controller Service at the controller level

In the controller level:
Create valid StandardSSLContextService
Create DistributedMapCacheClientService that relies on the SSL CS
start StandardSSLContextService
see a validation error for DistributedMapCacheClientService saying:

"" is invalid because Failed to run validation due to java.lang.NullPointerException

This is due to this line[1]. It attempts to get the identifier of the process group but since it's associated with the controller and not a process group it fails with an NPE.

https://github.com/apache/nifi/blob/master/nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-framework-core/src/main/java/org/apache/nifi/processor/StandardValidationContext.java#L101