fix: handle errors while parsing dates in filters #260
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There were error, handling returned value of the date string parser. Problem was that the parser could return None value which was compared against other None or date which obviously does not compute.
Solution to this is to fail early on the parser function and handle the error correctly where the parser function is used. This lead to writing error handling to the MaybeRelativeDateField since the viewset using the function was correctly handling errors (just not the None values).
Before this, when giving badly formatted date parameter in the dateperiod end would have been okay and all the periods would be returned - not anymore, now it returns a validation error.
Refs HAUKI-564