InPlaceRealm: roles can be empty

Change-Id: I319c6dd9278f5ffe7bead046933ef9e24023c5a3
Reviewed-on: https://pirx.atteo.com/gerrit/523
Tested-by: Mr. Jenkins
Reviewed-by: Sławek Piotrowski <sentinel@atteo.com>
Merge remote-tracking branch 'official/master' into master