NIFI-12321 Avoid Exceptions when removing Python Processors

[exceptionfactory]

Summary

NIFI-12321 Updates the StandardPythonBridge.onProcessorRemoved() method to avoid throwing exceptions when called with a Processor Type and Version that is not registered.

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  • JDK 21

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[markap14]

Thanks for the fix @exceptionfactory changes look good to me. +1 will merge.