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backfill: Reverse flawed logic in SnapshotBranch generation

The previous code would nullify all non-null branches, and try to create a SnapshotBranch out of null branches.

Test Plan

noticed the bug in production; the tests that perform a comparison of in-memory storage contents now only test these the data superficially and need to be improved.


Migrated from D4473 (view on Phabricator)

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