[webui] Error creating association: java.lang.NullPointerException
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                 Key: ACE-41
                 URL: https://issues.apache.org/jira/browse/ACE-41
             Project: Ace
          Issue Type: Bug
          Components: Web UI
            Reporter: Filippo Diotalevi


When the user clicks on the   <->  (create association) button (any of them) 
without selecting the elements to associate, a popup saying "Error creating 
association: java.lang.NullPointerException" is displayed.

A more "user friendly" message should be displayed instead (or no message at 
all).

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