Ensure we pass matching images and segmentations to MVS
Ensure we pass matching images and segmentations to MVS

Summary: Currently MVS will just take these and often doesn't even segfault / fails silently

Reviewed By: mwerlberger

Differential Revision: D31990783

fbshipit-source-id: e4b5ee8b06431fc24568e4ac6ba799bdce29935f

mapillary/OpenSfM,mapillary/OpenSfM,mapillary/OpenSfM,mapillary/OpenSfM,mapillary/OpenSfM