Cherry-pick #21882 to 7.x: Fix panic on add_docker_metadata close #21889
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Cherry-pick of PR #21882 to 7.x branch. Original message:
If the processor was not properly initialized, for example because it
couldn't access the docker socket, then the watcher will be nil. Avoid
trying to stop the watcher in that case.
No changelog needed as the change introducing this issue hasn't
been released.
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