To avoid lots of follow-up errors where the root cause is a failed
prototype resolution or a prototype cycle.

Task-number: QTCREATORBUG-4952
Change-Id: Id474c8c6c152c993aca8c6c421b6d88eb1481676
Reviewed-on: http://codereview.qt.nokia.com/36


Reviewed-by: Thomas Hartmann <Thomas.Hartmann@nokia.com>