Do not create a game with empty title using only whitespace

[Marc-Spector]

In the "Custom Games" tab, I saw the game with the empty title. The title contains only a whitespace.

Client Version:
2021.10.0

[Askaholic]

I’ll make a server issue as well. Should there be a minimum length for the title?

[Askaholic]

Checks for empty titles were added to the server in v1.14.0. Now I am seeing some errors in the log files which means the client' isn't properly sanitizing everything:

WARNING  Jan 06  22:47:22 LobbyConnection                Client error: Title must not be empty.
WARNING  Jan 06  20:43:46 LobbyConnection                Client error: Title must contain only ascii characters.

This is how the checks look on the server end

if not title.isascii():
    raise ClientError("Title must contain only ascii characters.")
if not title.strip():
    raise ClientError("Title must not be empty.")