When the FileImporter successfully finishes an import it should not only add a `NullRevision` to inform about the import step in the revision history but should also add an entry to the upload log and one to the import log.
Having the `NullRevision` and the upload log entry is the default for uploads [1] [2] (although it leads to "doubled" entries on the history page). Since we, apart from the upload, do an import, having an import log entry is the right thing to do.
[1] https://commons.wikimedia.org/w/index.php?title=File:Usenet_Services_Mind_Map.svg&action=history
[2] https://commons.wikimedia.org/w/index.php?title=Special:Log&page=File%3AUsenet+Services+Mind+Map.svg
**Acceptance Criteria**
[] Add an entry to the import log associated with the null revision of the import
[] Add an entry to the upload log associated with the null revision of the import (this is still slightly unclear, if we need that entry, too)
**Notes**
Most probably we will still just have one entry (the null revision) in the page history.
**Dev notes**
This includes tests