Max() arg is an empty sequence

[johnchurchill-DOIT]

I'm getting an error when I try and update (replace) an asset using a csv file. The error is (to me) somewhat vague. It just says max() arg is an empty sequence. Since my class isn't using max for anything, I'm curious if someone can help me by pointing to what it is that I may be supplying incorrectly? that would be much appreciated.

[johnchurchill-DOIT]

I broke my class apart and ran everything line by line and I can see that it occurs when I am attempting to get the latest output_schema like this. output = input_schema.get_latest_output_schema()