scrub: Handle MutagenError (fix #2716)

In older versions of Mutagen, an IOError indicated things like
permissions errors. Now, a custom MutagenError is raised. Now we handle
both.

beetsplug/scrub.py

@@ -24,6 +24,7 @@ from beets import ui
 from beets import util
 from beets import config
 from beets import mediafile
+import mutagen
 
 _MUTAGEN_FORMATS = {
     'asf': 'ASF',
@@ -106,7 +107,7 @@ class ScrubPlugin(BeetsPlugin):
                 for tag in f.keys():
                     del f[tag]
                 f.save()
-            except IOError as exc:
+            except (IOError, mutagen.MutagenError) as exc:
                 self._log.error(u'could not scrub {0}: {1}',
                                 util.displayable_path(path), exc)
 

docs/changelog.rst

@@ -63,6 +63,8 @@ Fixes:
   ignored.
 * :doc:`/plugins/replaygain`: Fix album replaygain calculation with the
   gstreamer backend. :bug:`2636`
+* :doc:`/plugins/scrub`: Handle errors when manipulating files using newer
+  versions of Mutagen. :bug:`2716`
 
 For developers: