null pointer protection

git-svn-id: http://www.openflipper.org/svnrepo/OpenFlipper/branches/Free@3669 383ad7c9-94d9-4d36-a494-682f7c89f535

Popup.cc

@@ -42,8 +42,10 @@
 void DataControlPlugin::slotPopupRemove (  ) {
   QItemSelectionModel* selection = view_->selectionModel();
 
+  if (selection == 0) return;
+  
   // Get all selected rows
-  QModelIndexList indexList = selection->selectedRows ( 0 ); 
+  QModelIndexList indexList = selection->selectedRows(); 
     
   for ( int i = 0 ; i < indexList.size() ; ++i) {