Previously it also poped up and showed a build failure if there were
any error-type tasks in 'My Tasks', 'Analyser' or 'QML'.

Change-Id: Ie86be0afe1f0b7571b2cb764b7c53f282183b513
Reviewed-on: http://codereview.qt.nokia.com/2807


Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>