Failed to run colmap2mvsnet.py when some image is not registered

Traceback (most recent call last):
File "third_party/Vis-MVSNet/colmap2mvsnet.py", line 350, in
for p3d_id in images[i+1].point3D_ids:
KeyError: 1

When running with `run_neuralangelo-colmap_dense.sh`, due to the image is unregistered.

Start with third_party/Vis-MVSNet/colmap2mvsnet.py around line 350 and reproduce the failure through run_neuralangelo-colmap_dense.sh using input that contains an unregistered image. Check closed pull request #9 for prior work, then verify that the conversion completes without a KeyError when an image is unregistered.

Written by the indexing model from the issue text.