Disabling reset of 'weights' array for reject level mode of groupRectangles function.

modules/objdetect/src/cascadedetect.cpp

@@ -64,7 +64,7 @@ void groupRectangles(std::vector<Rect>& rectList, int groupThreshold, double eps
 
     if( groupThreshold <= 0 || rectList.empty() )
     {
-        if( weights )
+        if( weights && !levelWeights )
         {
             size_t i, sz = rectList.size();
             weights->resize(sz);