Checker: Resolve possibly failure of grant check when starting up
Checker: Resolve possibly failure of grant check when starting up

Might have occured when restarting the Checker after the competition has
started and a result for tick 0 (and team 1) has been stored.

Closes: https://github.com/fausecteam/ctf-gameserver/issues/63
Co-authored-by: Simon Ruderich <088e16a1019277b15d58faf0541e11910eb756f6@ruderich.org>

fausecteam/ctf-gameserver,fausecteam/ctf-gameserver,fausecteam/ctf-gameserver,fausecteam/ctf-gameserver,fausecteam/ctf-gameserver