Bugfix: When deleting all keyframes from F-Curves, don't delete the F-Curve if

it has a driver

source/blender/editors/space_graph/graph_edit.c

@@ -882,8 +882,12 @@ static void delete_graph_keys(bAnimContext *ac)
 		delete_fcurve_keys(fcu); 
 		
 		/* Only delete curve too if it won't be doing anything anymore */
-		if ((fcu->totvert == 0) && (list_has_suitable_fmodifier(&fcu->modifiers, 0, FMI_TYPE_GENERATE_CURVE) == 0))
+		if ((fcu->totvert == 0) && 
+			(list_has_suitable_fmodifier(&fcu->modifiers, 0, FMI_TYPE_GENERATE_CURVE) == 0) &&
+			(fcu->driver == NULL)) 
+		{
 			ANIM_fcurve_delete_from_animdata(ac, adt, fcu);
+		}
 	}
 	
 	/* free filtered list */