test: fix BackgroundConsumer error log #814
Merged
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We #770 that clears some variables that were causing a memory leak in the bidirectional streaming classes. This change lead to a potential null pointer exception during the shut-down process when the BackgroundConsumer tries to access the removed callback.
The issue would only come up when the background thread failed to finalize within 1 second, and the error would be swallowed internally. But it would result in an error log that should be avoided
This PR does a None check to avoid emitting the error log
Fixes #788