`test_missing_camera` is failing

[jasper-tms]

In tests.py, test_missing_camera() attempts to call df3d-cli on a folder that doesn't exist. I think some lines of code may be missing that prepare a folder with image data from only some cameras.

If anyone knows whether df3d is actually supposed to behave well will some missing cameras, or if this was a test that someone optimistically started writing without any actual implementation of the desired behavior in the package yet, let me know so I know whether to care about this test failing :sweat_smile: