Return True in is_tax_known() when the basket is empty #4166
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Added fix to is_tax_known() in oscar.apps.basket.abstract_models.AbstractBasket and a test to verify it works with an empty basket.
Also, modified the 2 tests in tests.integration.order.TestShippingOfferForOrder which relied on is_tax_known() incorrectly returning True when the basket was empty.
Replaces PR 4140