System information (version)

• OpenCV => 4.4.0
• Operating System / Platform => Arch 64 Bit
• Compiler => GCC 10.2.0

Detailed description

Loading the following ONNX model causes OpenCV to fail with:

cv2.error: OpenCV(4.4.0) /build/opencv/src/opencv-4.4.0/modules/dnn/src/layers/reshape_layer.cpp:149: error: (-215:Assertion failed) dstTotal != 0 in function 'computeShapeByReshapeMask'

Steps to reproduce

import cv2
net=cv2.dnn.readNetFromONNX('model.onnx') 

The model is quite big. But I'll upload it if required.

Thanks in advance for some hints!