Parse the WMI packages output.

def ParseMultiple(self, result_dicts):
    """Parse the WMI packages output."""
    status = rdf_client.SoftwarePackage.InstallState.INSTALLED

    packages = []
    for result_dict in result_dicts:
      result = result_dict.ToDict()

      # InstalledOn comes back in a godawful format such as '7/10/2013'.
      installed_on = self.AmericanDateToEpoch(result.get("InstalledOn", ""))
      packages.append(
          rdf_client.SoftwarePackage(
              name=result.get("HotFixID"),
              description=result.get("Caption"),
              installed_by=result.get("InstalledBy"),
              install_state=status,
              installed_on=installed_on))

    if packages:
      yield rdf_client.SoftwarePackages(packages=packages)