Jhonathan Abreu
046fb456f8
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* Allow Python option filter functions to return None The option filter universe is modified in place by the filter methods (strikes, expiration, etc.), whose return value is only necessary for chaining. A Python filter function that returns None would kill the algorithm with a NullReferenceException. * Allow C# option filter functions to return null and add regression algorithms Adds C#/Python regression algorithms asserting that option filter functions are allowed to mutate the universe in place and return null/None instead of the universe, which is only necessary for chaining.