CBG-1269 - Abort import of doc if importListener is stopped during in-flight feed event processing (#4917)
CBG-1269 - Abort import of doc if importListener is stopped during in-flight feed event processing (#4917)

* Add terminator check in ImportFeedEvent to avoid use of nil bucket

* Add logging in the event of aborting import based on terminator
couchbaselabs/sync_gateway,couchbaselabs/sync_gateway,couchbaselabs/sync_gateway,couchbaselabs/sync_gateway