python: disable assertion in NumpyAllocator

modules/python/src2/cv2.cpp

@@ -149,7 +149,7 @@ public:
     {
         if( data != 0 )
         {
-            CV_Error(Error::StsAssert, "The data should normally be NULL!");
+            // issue #6969: CV_Error(Error::StsAssert, "The data should normally be NULL!");
             // probably this is safe to do in such extreme case
             return stdAllocator->allocate(dims0, sizes, type, data, step, flags, usageFlags);
         }