Fix for a crash. May be the cause of tickets #275 and #268

git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@5992 c8812cc2-4d05-0410-92ff-de0c093fc19c

src/gui/qgsmaptoolidentify.cpp

@@ -423,5 +423,6 @@ void QgsMapToolIdentify::resultsDialogGone()
 
 void QgsMapToolIdentify::deactivate()
 {
-  mResults->done(0); // close the window
+  if (mResults)
+    mResults->done(0); // close the window
 }