Save button should be disabled on no change

[ThomasPonnet]

16:52 16.11.2014 Creating a new map the Save button is greyed out - OK
16:52 16.11.2014 Selecting Mindmup (Gold) from the dropdown menu next to the save button, then cancelling the popup window enables the save button. The Mindmap is then saved even though nothing has been created, yet. I'd expect it still to be disabled. Cancelling out of another dialog shouldn't have an impact on enabling the button.

Windows 7, Firefox 33.1