MapEntries.dispose tries to access potentially unavailable repository during 
shutdown
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                 Key: SLING-1579
                 URL: https://issues.apache.org/jira/browse/SLING-1579
             Project: Sling
          Issue Type: Improvement
          Components: JCR
    Affects Versions: JCR Resource 2.0.6
            Reporter: Honwai Wong
            Priority: Minor


During shutdown of the instance, the JcrResourceResolverFactoryImpl's 
deactivate() method is called to dispose of its internal mapping entries. This 
calls the MapEntries#dispose method which tries to remove itself as 
EventListener from the ObservationManager which fails: the used session has 
already been closed, I assume because the repository as such has already been 
stopped.

The exceptions should rather be logged on a WARN level as this situation seems 
to be perfectly legal. An additional check via Session#isLive might also make 
sense.

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