[PR #2437/cc48bb4c backport][3.14] Fix a serializer viewset interaction issue #2443
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This is a backport of PR #2437 as merged into main (cc48bb4).
Since a default value is provided on the publication serializer, it can't properly fall back to the repository settings: https://github.com/pulp/pulp_rpm/blob/main/pulp_rpm/app/viewsets.py#L272-L275
We need it to return
None
when not provided so that ^ line can work properly.closes #2430