[Issue 1259][producer] Prevent panic when calling Flush on closed producer #1260
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Fixes #1259
Motivation
When calling Flush or FlushWithCtx after closing the producer, it will panic.
Modifications
Check the state of the producer before proceeding with a flush and return an error if it is closed already.
Verifying this change
This change added tests and can be verified as follows:
Does this pull request potentially affect one of the following parts:
None
Documentation