Update plex_dupefinder.py - fix no episode number

[RandomRhythm]

fix #76

Error processing unattributed TV episode:

  File "C:\git\plex_dupefinder\plex_dupefinder.py", line 353, in <module>
    item.grandparentTitle, int(item.parentIndex), int(item.index), item.title)
TypeError: int() argument must be a string, a bytes-like object or a number, not 'NoneType'

The above errors happens when an episode is encountered that does not have season/episode number attribution. Example:

<Episode:81092:Animals-Unscripted-s2024eNone>

Not much can be done by dupefinder since there is no episode attribution. Decided against printing or logging an exception.