fix: shutdown error on streaming pull callback error #40
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Fixes #39.
This PR fixes an error that can happen if cancelling a streaming pull future when the streaming pull manager has already been shut down due to the error in the user callback.
How to test
Actual result (before the fix):
An error occurs during the shutdown:
Expected result (after the fix):
No internal error occurs during the shutdown, except for the error from the user callback, as expected.
PR checklist