Minor fixes for the regular payment workflow #216
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What are the relevant tickets?
mitodl/hq#6042
Description (What does it do?)
Fixes a few things that were noticed while working on refunds:
How can this be tested?
Automated tests should pass.
Importing or updating a product should properly create a version.
Opening a basket that has stuff in it in the Django Admin should also show you the items in the basket.
Checking out a basket that is zero value (i.e. with a 100% off discount) should result in a success status, not redirecting you to elsewhere.
If you try to check out with a product that doesn't have versions for whatever reason, it should fail. (In practice this shouldn't happen.)
New orders should have an associated IntegratedSystem.