[Discord] Change song to required parameter for audio command

Discord/cogs/audio.py

@@ -54,7 +54,7 @@ async def cog_check(self, ctx):
         fallback = "play"
     )
     @commands.check_any(checks.is_permitted(), checks.is_guild_owner())
-    async def audio(self, ctx, *, song: Optional[str]):  #elif options[0] == "full":
+    async def audio(self, ctx, *, song: str):
         '''
         Audio System - play a song
         All audio subcommands are also commands
@@ -73,9 +73,6 @@ async def audio(self, ctx, *, song: Optional[str]):  #elif options[0] == "full":
                 raise RuntimeError(
                     "audo join command not found when audio command invoked"
                 )
-        if not song:
-            await ctx.embed_reply(":grey_question: What would you like to play?")
-            return
         if "playlist" in song:
             await self.players[ctx.guild.id].add_playlist(ctx, song)
             return