Description of problem:

When installing a package from a repository whose GPG key has not yet been imported into the RPM database (but with the key present in /etc/pki/rpm-gpg), gnome-packagekit asks the user whether he trusts the repository's signing key.  If the user klicks "Yes", gnome-packagekit asks for a password and then pretends to install the package.  In reality, however, nothing gets installed.  

The user gets no information why the package could not be installed and what he can do about it.  Using gnome-packagekit, it is impossible to install signed packages whose keys has not already been imported using "rpm --import".

Version-Release number of selected component (if applicable):

gnome-packagekit-2.30.3-1.fc13.i686

How reproducible:

Steps to Reproduce:
1. Add a new repository by installing the respective "add repository" package (examples: RPM Fusion repositories, Adobe repository).  This will install signing keys in /etc/pki/rpm-gpg.
2. Mark a package from this repository from installation and klick "Apply".
3. gnome-packagekit requires authorization to install a signed package.  Enter the root password.
4. gnome-packagekit asks the user whether he trusts the key of the repository.  Klick "Yes".
5. gnome-packagekit requires authorization for trusting a signing key.  Enter the root password.
  
Actual results:

The package is downloaded, but the signing key of the repository is not imported and the package is not installed.  

Expected results:

gnome-packagekit should import the signing key and install the package.  If, for some reason, the key cannot be imported, the user should be informed about the cause and a possible solution.