NPE in MapContent.listenToMapLayers method
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                 Key: GEOT-3697
                 URL: https://jira.codehaus.org/browse/GEOT-3697
             Project: GeoTools
          Issue Type: Bug
          Components: render
    Affects Versions: 8.0-M0, 2.7.0
            Reporter: Michael Bedward
            Assignee: Michael Bedward
             Fix For: 2.7.3, 8.0-M1


MapContent.listenToMapLayers fails to check for a null layerList field. The fix 
is to use its layers() method internally rather than the field directly since 
this does the check and creates a list if required.

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