Trying to fix flann python wrapper issue

modules/features2d/src/matchers.cpp

@@ -1022,13 +1022,28 @@ FlannBasedMatcher::FlannBasedMatcher( const Ptr<flann::IndexParams>& _indexParam
 void FlannBasedMatcher::add( InputArrayOfArrays _descriptors )
 {
     DescriptorMatcher::add( _descriptors );
+    if(_descriptors.isUMatVector() || _descriptors.isUMat())
+    {
         std::vector<UMat> descriptors;
         _descriptors.getUMatVector(descriptors);
-
         for( size_t i = 0; i < descriptors.size(); i++ )
         {
             addedDescCount += descriptors[i].rows;
         }
+    }
+    else if(_descriptors.isMatVector() || _descriptors.isMat())
+    {
+        std::vector<Mat> descriptors;
+        _descriptors.getMatVector(descriptors);
+        for( size_t i = 0; i < descriptors.size(); i++ )
+        {
+            addedDescCount += descriptors[i].rows;
+        }
+    }
+    else
+    {
+        CV_Assert( _descriptors.isUMat() || _descriptors.isUMatVector() || _descriptors.isMat() || _descriptors.isMatVector());
+    }
 }
 
 void FlannBasedMatcher::clear()