Introduce virtual MenuNodes (#15880).
They are characterized by having a blank url. they will only be rendered if the user is authorized to see at least one of its children. they render as links which do nothing when clicked. Patch by Jan Schulz-Hofen. git-svn-id: https://svn.redmine.org/redmine/trunk@15501 e93f8b46-1217-0410-a6f0-8f06a7374b81
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