fix errors when timing out while resizing

cogs/emote.py

@@ -171,6 +171,8 @@ class Emotes(commands.Cog):
 			return (
 				'An error occurred while creating the emote:\n'
 				+ utils.format_http_exception(ex))
+		except errors.ImageResizeTimeoutError:
+			raise
 		except asyncio.TimeoutError:
 			return 'Error: retrieving the image took too long.'
 		except ValueError:

utils/errors.py

@@ -1,5 +1,4 @@
-#!/usr/bin/env python3
-# encoding: utf-8
+import asyncio
 
 from discord.ext import commands
 
@@ -19,6 +18,11 @@ class EmoteManagerError(commands.CommandError):
 	"""Generic error with the bot. This can be used to catch all bot errors."""
 	pass
 
+class ImageResizeTimeoutError(EmoteManagerError, asyncio.TimeoutError):
+	"""Resizing the image took too long."""
+	def __init__(self):
+		super().__init__('Error: resizing the image took too long.')
+
 class HTTPException(EmoteManagerError):
 	"""The server did not respond with an OK status code."""
 	def __init__(self, status):