I apologise for this particularly incoherent commit https://github.com/GrahamTheCoder/NuGet.Extensions/commit/0ae983d

There is indeed a change in the console output here, but it's in ordering, and wording rather than in inclusion/exclusion (as far as I can see).

The commit starts using separate properties to get the successful and failed mappings. This method is now only called on the successful mappings so the failure case was redundant.
See line 68 for where the errors are reported after the successes, using the same method as is used when !OutputPackageConfig.

The message seemed equally appropriate in both cases so I thought I'd reuse it - in retrospect, this really should have been a separate commit.