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TypeError: 'NoneType' object is not iterable

See original GitHub issue

Describe the bug A crash

Provide version info python 3.6 opencv 4.1 master

Provide error message

 File "/home/user/anaconda3/envs/mmdet2/lib/python3.7/site-packages/vidstab/VidStab.py", line 516, in stabilize
   output_fourcc=output_fourcc, progress_bar=bar)
 File "/home/user/anaconda3/envs/mmdet2/lib/python3.7/site-packages/vidstab/VidStab.py", line 214, in _apply_transforms
   self._gen_next_raw_transform()
 File "/home/user/anaconda3/envs/mmdet2/lib/python3.7/site-packages/vidstab/VidStab.py", line 116, in _gen_next_raw_transform
   matched_keypoints = vidstab_utils.match_keypoints(optical_flow, self.prev_kps)
 File "/home/user/anaconda3/envs/mmdet2/lib/python3.7/site-packages/vidstab/vidstab_utils.py", line 70, in match_keypoints
   for i, matched in enumerate(status):
TypeError: 'NoneType' object is not iterable

Provide code snippet

if not os.path.exists(folder_out):
    os.makedirs(folder_out)

for name in os.listdir(folder):
    path_in = os.path.join(folder, name)
    path_out = os.path.join(folder_out, name)
    assert os.path.exists(path_in)
    stabilizer = VidStab()
    stabilizer.stabilize(input_path=path_in, output_path=path_out,
                         #playback=True,
                         show_progress=True,
                         output_fourcc='mp4v'
                         )

Are you able to provide the video? I able if you need, just mention about it

Edited by @AdamSpannbauer for some formatting stuff.