Date range filter works fine with nullable fields now. #1402
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Old behavior: filter adds interval '0000-00-00' - '9999-12-31' by default, so, null isn't in this range and rows with null-value in filtered field is out of query result.
But if user didn't choose any date, they don't care about value necessity, value might be null, less than 0000-00-00 etc.
New behavior: until user chooses smth in filter, it won't be applied to DB query.