minetest/minetest — pull request #579 by 0gb-us (2013-03-30 08:51:48+00:00)
Title: Don't grant priveleges to non-existent players.

When accidentally misspelling a name, privileges are sometimes granted to non-existent players, leaving them with the extra privileges, but without the default privileges, if they ever join the server. This corrects that by disallowing /grant from working with invalid players. For completeness, it does the same for /revoke.