Here are some small fixes to make the amusifier not crash on Python 3.13. I've tested this manually on 3.13 and also on 3.8 to check for regressions, and it works on both.

To explain:

In attributes.py, dict is the namespace of the class, so it contains the parameter declarations in the classes but also a bunch of variables made by Python. The latter all have dunder names, the former don't, but instead of checking the name of the key, we check the type of the value. Python 3.13 added a new variable that happens to have an empty tuple as its value, so we crash.

In base.py, function is None (by design, apparently) and None used to have a __doc__ that was None, but in Python 3.13 it's a string describing the None object. So it's no longer the case that any object that has a __doc__ also has a __name__, because now None has the former but not the latter. That was questionable anyway. So there's an extra check for None here.

Fixes #1082