Fix remaining failures in shoulda-matcher

Starting with Rails 5, belongs_to now adds a presence validation to the
association, and so as of shoulda-matchers 4.0.0 the belong_to matcher
follows suit and tests that this validation is there by setting the
association to nil and asserting that there are validation errors. This
exposed an error with the `validate_branches` method: we need to check
the source and target project exist.

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