Well according to the Twitter pages of both clubs, neither of them felt the need to wish Scotland luck either.
As someone who supports Celtic and is a supporter of Scotland as well I have absolutely no issue with Celtic tweeting Ireland luck and I'm as gutted as anyone in here about Ireland getting a victory last night, yet still I find it madness that anyone could get wound up by Celtic sending an electronic message wishing a country good luck for a match.
They can wish luck to whoever the f**k they like for all I care, it has absolutely zero effect on me or anyone else for that matter.