Description of problem:
Searching for packages in the PackageKit gui results in an internal system error: "ValueError: too many avlues to unpack"

Version-Release number of selected component (if applicable):
PackageKit-yum-0.5.7-1.fc12.i686

How reproducible:
Always.

Steps to Reproduce:
1. Open PackageKit.
2. Enter a package name in the search bar (I used 'mpstat').
3. Press 'Find'.
  
Actual results:
A dialog box appears with the error message: "An internal system error has occurred."

Traceback (most recent call last):
  File "/usr/share/PackageKit/helpers/yum/yumBackend.py", line 391, in _do_search
    for (pkg, inst) in res:
ValueError: too many values to unpack

Expected results:
PackageKit should return a list of packages matching the search criteria.

Additional info:
Repos configured:
 * Adobe Systems Incorporated
 * Fedora 12 - i386
 * Fedora 12 - i386 Updates
 * Open Client for Linux 2.0 Fedora 12 (<-- IBM repo)
 * RPM Fusion for Fedora 12 - Free
 * RPM Fusion for Fedora 12 - Free - Updates