apply patch for #3347 from kcube

git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@15175 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: jef

src/gui/qgssearchquerybuilder.cpp

@@ -203,7 +203,7 @@ long QgsSearchQueryBuilder::countRecords( QString searchString )
     return -1;
 
   QgsSearchTreeNode* searchTree = search.tree();
-  if ( searchTree == NULL )
+  if ( !searchTree )
   {
     // entered empty search string
     return mLayer->featureCount();
@@ -235,6 +235,12 @@ long QgsSearchQueryBuilder::countRecords( QString searchString )
 
   QApplication::restoreOverrideCursor();
 
+  if ( searchTree->hasError() )
+  {
+    QMessageBox::critical( this, tr( "Error during search" ), searchTree->errorMsg() );
+    return -1;
+  }
+
   return count;
 }