Check if createProcess failed

[Archiatrus]

https://github.com/Cryptyc/Sc2LadderServer/blob/master/src/LadderManager.cpp#L616

Sometimes executing the command for the bot fails. Starting then the GameUpdate functions anyway sometimes causes trouble. Best case we only have to wait through all the sleeps even though we already know that the result is ResultType::PlayerXCrash. Worst case I had was that the Programm got stuck,