Hi, I think it's just part of the idiom. Like in " It was my mother who noticed there was something wrong". That "it" can't refer to "my mother", it does not refer to anything, but you say it that way anyway.
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LiveinjapanIf it wasn't/weren't for the fact that Chloe would be offended, I wouldn't go to the party."Weren't" is the proper form: subjunctive with contrary to fact thought.
It refers to nothing, just means the situation, right?
Thanks
LIJ