Mocked querysets aggregation now handles None values.

[szykin]

While using django-mock-queries for aggregation testing, I faced problems when trying to mock instances with None values in fields. I define mock instances like this:

first_product=MockModel(price = 2)
second_product=MockModel(price=4)
none_product=MockModel(price=None)

Built-in functions like min() raise an exception when there is a None value in values list.

Now mock_set.aggregate() more precisely mimics Django behaviour when working with None values in fields:

• Sum, Max, Min return None by default, and work only with not None values
• Avg divident is sum of not None values, divisor is len() of not None values
• Count returns 0 by default and works only with not None values.

[codecov-io]

Current coverage is 100% (diff: 100%)

Merging #21 into master will not change coverage

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[stphivos]

Thanks!