To reproduce, create a GetFile processor and point it to `./data` and create that directory. Start the processor. Stop NiFi and rename the directory. Start NiFi again. On restart, the Processor will be invalid. If you rename the directory back to `./data` then the processor will become valid and run. However, if instead you attempt to update the Processor to point to a different directory, it will give an error saying that the Processor cannot be updated because it is not stopped.