PreferencesManager can throw NPE after being stopped.
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                 Key: FELIX-3334
                 URL: https://issues.apache.org/jira/browse/FELIX-3334
             Project: Felix
          Issue Type: Bug
          Components: Preferences Service
    Affects Versions: prefs-1.0.4
            Reporter: J.W. Janssen
         Attachments: quickfix.patch

PreferencesManager#bundleChanged tries to intercept bundles that are 
uninstalled. However, if the PreferencesManager itself is stopped, it does not 
unregister itself as bundle listener, causing possible NPEs when other bundles 
depending on the preferences service are stopped later on, for example during a 
shutdown.

I've got a patch available, will attach it to this issue to be applied.

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