Should not add empty custom category to display category list

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.0.0
• Fix Version/s: 2.0.0 M2
• Component/s: Wizards, Wizards > Portlet
• Labels: None
• Environment: Liferay IDE 2.0.0.20130808-1710 installed on eclipse-juno, portal611-ce-ga2 / portal6.2.0-ce-b1
• Git Pull Request: https://github.com/gamerson/liferay-ide/pull/285

• setup sdk and server
• new liferay portlet project
• new liferay portlet > next > next
• delete default "Sample" display category and make sure it's empty
• finish
• new liferay portlet using a new portlet name > next > next
  will see empty category in the "Display Category" list