I've had the same annoyance; and it struck me as silly that the override file be a mandatory argument in the first place, if there are legitimate situations where it isn't needed (the tutorial I was following used /dev/null as a workaround)
I've attached a patch which makes the override argument optional, and if it isn't supplied, the warnings about it won't be shown. There's a bit of ugly indent fiddling, but I couldn't see any way around that (Ideally I'd just stick an if around one function call, but there are no functions, the whole script is one monolithic block...) -- Shish
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