Umbrello coredumps on RHEL 6

Issue

When we follow these steps umbrello core dumps:

1. Open the attached model it in Umbrello on RHEL6
2. Go to the "Set diagnostic setting sequence" tab.
3. Click on "Synchronous Message" in the Diagram toolbar.
4. Add the message between the "SetDiagnosticSettingObject" and the
   "AbstractLogging" objects by first clicking on the end of the dashed line
   coming from "SetDiagnosticSetting", and then clicking on dashed line coming
   from "AbstractLogging".