Fix corrupt DB entry handling when loading package entries.

* scan loops no longer abort on corrupt entries
* reloading a cache package (and discovering it corrupt) no longer prints 2 messages
  and uses the pre-build "remove from package cache" function

NOTE: The TODOs in there are important for later w.r.t. cleaning up corrupt DB
entries but there are some logical complexities with doing so, so I'm holding
off for now.

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