Assign color when only masks are initialized (without bbox)

[antoinedelplace]

Here only the option where the boxes are initialized works.
The option where the masks are initialized is not dealt with.

detectron2/detectron2/utils/video_visualizer.py

Line 104 in ebe8b45

_DetectedInstance(classes[i], boxes[i], mask_rle=None, color=colors[i], ttl=8)

File "/home/ubuntu/doc/code/MIMO-unofficial/venv/lib/python3.10/site-packages/detectron2/utils/video_visualizer.py", line 104, in <listcomp>
    _DetectedInstance(classes[i], boxes[i], mask_rle=None, color=colors[i], ttl=8)
TypeError: 'NoneType' object is not subscriptable

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[github-actions]

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