A earlier fix lost track after some updates

[originlake]

Hi, I noticed a problem caused by issue described here((https://github.com/OpenDroneMap/OpenSfM/pull/25) occurred again. The fix was applied to 319 but not inherited in later versions. Someone else also posted about problem caused by this in the forum https://community.opendronemap.org/t/stitching-failing-any-ideas-why/18953/6