Both are supported during import from destination data.
But both were not part of functional tests yet.
They are added in order to ensure that future changes wont break import
of that data
The import already worked without category, but triggered a warning.
Tests were extended to always work with category, except in new test
case.
All tests were extended to check for empty logs in the end.
The import now checks whether category should be imported and ignores
further processing if not configured.
Relates: #9542
