Fix rare crash.

In case one stoped the running application on the device, removed the
project from the IDE and then closing the app output window would crash.

src/plugins/qt4projectmanager/qt-maemo/maemorunconfiguration.cpp

@@ -1257,6 +1257,9 @@ void MaemoRunControl::executionFinished()
 
 void MaemoRunControl::stop()
 {
+    if (!isRunning()
+        return;
+
     stoppedByUser = true;
     if (isDeploying()) {
         stopDeployment();