Description of problem:
PackageKit pretends to get update list successfully but returns empty list even though updates are available (checked by yum command). Forcing 
list refresh (via apper for example) does not help.
messages in PackageKit log:
refresh-cache transaction /10219_ccaadcbb from uid 1000 finished with success after 212ms
get-updates transaction /10220_abddcbbd from uid 1000 finished with success after 103ms
get-updates transaction /10221_ceebaada from uid 1000 finished with success after 53ms
get-updates transaction /10222_bdceadca from uid 1000 finished with success after 51ms

Version-Release number of selected component (if applicable):
1.0.4-1.fc21.x86_64

How reproducible:
always

Steps to Reproduce:
1. Use any packagekit client (apper) to view updates
2. 
3.

Actual results:
Update list is always empty even if updates are really available

Expected results:


Additional info: