fixed selection crashes.

src/model/xqviewmodel.cpp

@@ -39,6 +39,13 @@ void showItemList( const XQItemList& list)
   qDebug();
 }
 
+void showSelectionList( const QModelIndexList& list)
+{
+  for(const auto& entry : list )
+    qDebug() << " --- SelectionList: " << entry.data().toString();
+  qDebug();
+}
+
 
 //! Konstruktor mit parent.
 
@@ -252,6 +259,9 @@ void XQViewModel::onActionTriggered(QAction* action)
   QModelIndex currentIndex = treeTable()->currentIndex();
   command->setOriginIndex(currentIndex);
   // store the row positions of the selected indices
+
+  qDebug() << " --- Before saveNode: " << selectionList.isEmpty();
+  showSelectionList(selectionList);
   command->saveNodes( selectionList );