UnboundLocalError when providing any 'hints'

[hcphoenix]

Steps to reproduce:

1. Download LamentOfDilbert.zip (any file I've tried this with will do, but just in case...)
2. Run crosslooper --loop-len-min 168 LamentOfDilbert.ogg from inside any folder

You'll get an error like this: UnboundLocalError: cannot access local variable 'best_length' where it is not associated with a value

Occurs on both Windows and Debian with Python 3.12.4.

168 (i.e. 2 mins 48 seconds) is a reasonable value for the loop length of the test file, which is set up to loop very cleanly. I haven't yet had a file I've tested crosslooper with where hinting with args didn't give either this error or a result identical to if I provided no hints.