plugin radiocol: fixed missing import

src/plugins/plugin_misc_radiocol.py

@@ -35,7 +35,7 @@ from sat.tools.games import TarotCard
 
 from time import time
 import os.path
-from mutagen.oggvorbis import OggVorbis
+from mutagen.oggvorbis import OggVorbis, OggVorbisHeaderError
 
 try:
     from twisted.words.protocols.xmlstream import XMPPHandler
@@ -224,6 +224,7 @@ class Radiocol():
         which trigger after the song has been played to play next one"""
         #TODO: need to check that there are still peoples in the room
         #      and clean the datas/stop the playlist if it's not the case
+        #TODO: songs need to be erased once played or found invalids
         radio_data = self.radios[room_jid.userhost()]
         queue = radio_data['queue']
         if not queue: