Cannot get LDESClientProcessor to replay events

[SBylemans]

Describe the bug
When trying to get an LDESClientProcessor, which is configured with a Postgres DB, to reprocess members by truncating the tables in the Postgres DB, an error is thrown that the connection has been closed. We tried to do this after experiencing #678.

To Reproduce
Create LDESClientProcessor with postgres DB for state. After running for a little while, stop the processor and try to replay members by deleting state in the postgres DB and restarting processor.

Expected behavior
Deleting state in the postgres DB should allow the processor to reprocess members.

Screenshots

Desktop (please complete the following information):

• Processor version: 2.3.0
• NiFi version: 1.26