Don't crash with no attribute set in graduated renderer

NathanW2 · NathanW2 · commit 428375ed4c1d · 2014-09-28T16:36:18.000+10:00
diff --git a/src/core/symbology-ng/qgsgraduatedsymbolrendererv2.cpp b/src/core/symbology-ng/qgsgraduatedsymbolrendererv2.cpp
@@ -954,8 +954,10 @@ QList<double> QgsGraduatedSymbolRendererV2::getDataValues( QgsVectorLayer *vlaye
 
 void QgsGraduatedSymbolRendererV2::updateClasses( QgsVectorLayer *vlayer, Mode mode, int nclasses )
 {
-  // Custom classes are not recalculated
+  if ( mAttrName.isEmpty() ) return;
+
   setMode( mode );
+  // Custom classes are not recalculated
   if ( mode == Custom ) return;
 
   if ( nclasses < 1 ) nclasses = 1;
@@ -965,6 +967,7 @@ void QgsGraduatedSymbolRendererV2::updateClasses( QgsVectorLayer *vlayer, Mode m
   double minimum;
   double maximum;
 
+
   int attrNum = vlayer->fieldNameIndex( mAttrName );
 
   if ( attrNum == -1 )
