classes_to_exclude is not filtering proteins correctly

[ardagoreci]

Hi @elkoz,

I noticed while visualizing the proteins that setting the classes_to_exclude method is not properly filtering the required classes. It runs with no issues, but it still returns proteins that are homomeric or heteromeric.
It might be removing some of the homomers/heteromers, but I haven't tested if it does.

Here is the code that I used for filtering and a few of the resulting proteins:

[elkoz]

Just in case, also keep in mind that this is filtering based on the biounit level. It is possible (and pretty common) that e.g. a heteromer protein has a single chain biounit, such biounits won't be filtered out by this.