Added error handling for .ascii img command

scroll.py

@@ -235,8 +235,12 @@ class Bot():
 								elif args[1] == 'img' and len(args) == 3:
 									url = args[2]
 									if url.startswith('https://') or url.startswith('http://'):
+										try:
 											content = urllib.request.urlopen(url).read()
 											ascii   = await img2irc.convert(content, int(self.settings['png_width']))
+										except Exception as ex:
+											await self.irc_error(chan, 'failed to convert image', ex)
+										else:
 											if ascii:
 												for line in ascii:
 													await self.sendmsg(chan, line)