After update miro to 4.0.1, miro crash during startup.
I need install audio/py-mutagen to run.



miro output:
Traceback (most recent call last):
  File "/usr/local/bin/miro.real", line 172, in <module>
    import miro.storedatabase
  File "/usr/local/lib/python2.7/site-packages/miro/storedatabase.py", line 68, in <module>
    from miro import convert20database
  File "/usr/local/lib/python2.7/site-packages/miro/convert20database.py", line 52, in <module>
    from miro import databaseupgrade
  File "/usr/local/lib/python2.7/site-packages/miro/databaseupgrade.py", line 49, in <module>
    from miro import schema
  File "/usr/local/lib/python2.7/site-packages/miro/schema.py", line 361, in <module>
    from miro.feed import (Feed, FeedImpl, RSSFeedImpl, SavedSearchFeedImpl,
  File "/usr/local/lib/python2.7/site-packages/miro/feed.py", line 72, in <module>
    from miro.item import FeedParserValues
  File "/usr/local/lib/python2.7/site-packages/miro/item.py", line 67, in <module>
    from miro import metadata
  File "/usr/local/lib/python2.7/site-packages/miro/metadata.py", line 39, in <module>
    from miro import coverart
  File "/usr/local/lib/python2.7/site-packages/miro/coverart.py", line 38, in <module>
    from mutagen import id3, mp4, flac
ImportError: No module named mutagen

Fix: 

Add audio/py-mutagen to miro dependency
How-To-Repeat: Install miro on system without py-mutagen
and try to run it.