index error out of range when using 🖋️

[Kilvoctu]

Getting reports of an error with recent PR #81

Something like:

pen[3] = [k for k, v in settings.global_var.simple_model_pairs.items() if v == fixed_short][0]
an index error out of range

The root of this issue comes from my poor handling of the models.csv

Currently the preferred way to populate models.csv is "simple" way as added with PR #68 (details there); that is, no file extension nor hash

That said, I need to support each method of models.csv format.
Will look into this later