Catch failures to send messages on exceptions

bot.py

@@ -91,6 +91,7 @@ async def on_command_error(error, ctx):
     except AttributeError:
         pass
 
+    try:
         if isinstance(error, commands.BadArgument):
             fmt = "Please provide a valid argument to pass to the command: {}".format(error)
             await ctx.message.channel.send(fmt)
@@ -118,6 +119,8 @@ async def on_command_error(error, ctx):
                 except:
                     traceback.print_tb(error.__traceback__, file=f)
                     print('{0.__class__.__name__}: {0}'.format(error), file=f)
+    except discord.HTTPException:
+        pass
 
 
 if __name__ == '__main__':