grammaticality - "As is customary" vs. "as it is customary"


I more often see the first version being used, but to me, that doesn't sound right because I can't see the subject there. I would definitely use the second one.


What am I missing here?


Update: searching "As is customary" on Google returns more results than "As it is customary", hinting the first form is the most widely used... but I don't know whether that is a good test.




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