Failing imager conversion test

[AnthonyHorton]

[lspitler]

@AnthonyHorton do you remember what this is?

[lspitler]

Found the unit test that is failing: https://github.com/AstroHuntsman/gunagala/blob/develop/gunagala/tests/test_imager.py#L110

As @AnthonyHorton says, it:
"implies the existence of a worrying bug somewhere in the code (unless the test itself is the bug)"