Alias does not handle space-only alias gracefully

[NeuroAssassin]

Command bugs

Command name

[p]alias add and [p]alias global add

What cog is this command from?

Alias

What were you expecting to happen?

My bot to say You attempted to create a new alias with a space but that name is an invalid alias name. Alias names may not contain spaces., or something close to that, handling it gracefully.

What actually happened?

Raised an error

Exception in command 'alias add' Traceback (most recent call last): File "/home/neuroassassin/Desktop/Red/modok/lib/python3.8/site-packages/discord/ext/commands/core.py", line 83, in wrapped ret = await coro(*args, **kwargs) File "/home/neuroassassin/Desktop/Red/modok/lib/python3.8/site-packages/redbot/cogs/alias/alias.py", line 142, in _add_alias is_command = self.is_command(alias_name) File "/home/neuroassassin/Desktop/Red/modok/lib/python3.8/site-packages/redbot/cogs/alias/alias.py", line 64, in is_command command = self.bot.get_command(alias_name) File "/home/neuroassassin/Desktop/Red/modok/lib/python3.8/site-packages/redbot/core/bot.py", line 196, in get_command com = super().get_command(name) File "/home/neuroassassin/Desktop/Red/modok/lib/python3.8/site-packages/discord/ext/commands/core.py", line 1144, in get_command obj = self.all_commands.get(names[0]) IndexError: list index out of range

How can we reproduce this issue?

[p]alias add " " ping or [p]alias global add " " ping. Must be only the space.

[Jackenmen]

This will be fixed by d.py 1.4