most commands moved into cogs

cogs/audio.py

@@ -41,8 +41,8 @@ class Audio(commands.Cog, name='Audio'):
                 def_audio_ls = await list_files()
 
                 if def_audio_db or audio_db is not None:
-                    if def_audio_db is None: def_audio_db = []
-                    if audio_db is None: audio_db = []
+                    if not def_audio_db: def_audio_db = []
+                    if not audio_db: audio_db = []
                     logger.info(f'Play audio from DB')
                     full_audio = def_audio_db + audio_db
                     await play_audio(f'audio/{random.choice(full_audio)}', self.bot, after.channel)