Fix error messages not sending

cogs/emote.py

@@ -106,6 +106,15 @@ class Emotes(commands.Cog):
 
 		return True
 
+	@commands.Cog.listener()
+	async def on_command_error(self, context, error):
+		if isinstance(error, errors.EmoteManagerError):
+			await context.send(str(error))
+
+		if isinstance(error, commands.NoPrivateMessage):
+			await context.send(
+				f'{utils.SUCCESS_EMOJIS[False]} Sorry, this command may only be used in a server.')
+
 	@commands.command(usage='[name] <image URL or custom emote>')
 	async def add(self, context, *args):
 		"""Add a new emote to this server.