bug fix

src/de/tudarmstadt/informatik/hostage/ui2/fragment/RecordOverviewFragment.java

@@ -1141,7 +1141,8 @@ public class RecordOverviewFragment extends UpNavigatibleFragment implements Che
         if (title.equals(FILTER_MENU_TITLE_GROUP)){
             ArrayList<String> titles = dialog.getSelectedItemTitles();
             if (titles.size() == 0) return;
-            this.groupingKey =  titles.get(DEFAULT_GROUPING_KEY_INDEX);
+            // ALWAYS GET THE FIRST ELEMENT (SHOULD BE ALWAYS ONE)
+            this.groupingKey =  titles.get(0);
         }
         this.actualiseListViewInBackground();