Dont show the edit preferences button if the gadget does not have any
user-editable preferences (either no prefs or all hidden)
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Key: RAVE-115
URL: https://issues.apache.org/jira/browse/RAVE-115
Project: Rave
Issue Type: Sub-task
Components: build & development
Affects Versions: 0.2-INCUBATING
Reporter: Jesse Ciancetta
Fix For: 0.2-INCUBATING
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