[PR #2041/15561b94 backport][0.23] [PULP-203] Fix a regression in migration 0056 #2042
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This is a backport of PR #2041 as merged into main (15561b9).
Having more than one collection version in the system prevents the migration 0056 to run, because null as a value is not allowed to appear more than once.
We need to clean this up very careful, becuase on some systems the migration may have applied cleanly.
fixes #2040