Change logic of adding a duplicate widget
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Key: RAVE-332
URL: https://issues.apache.org/jira/browse/RAVE-332
Project: Rave
Issue Type: Sub-task
Reporter: Jasha Joachimsthal
Assignee: Jasha Joachimsthal
Priority: Minor
The Validator can reject the new widget if its url is already present.
Then if for some reason DefaultWidgetService#registerNewWidget is called for a
URL that already exists, it can throw a (DuplicateItem)Exception instead of
returning null.
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