Description of problem:
Installing/upgrading a local package by selecting 'Sofware Instaler' after
right-clicking on the package in nautilus causes a traceback below.

Version-Release number of selected component (if applicable):pirut-1.1.12-1


How reproducible: always


Steps to Reproduce:
1. Download a new package
2. browse to the download location on nautilus 
3. Right-click on the package and select 'software installer'
  
Actual results: Opens up as if its going to work, but produces a traceback;
<<

Component: Software Installer
Summary: TB31e7d981 system-install-packages:109:populatePackages:AttributeError:
'SinglePackageInstaller' object has no attribute 'read_ts'

Traceback (most recent call last):
  File "/usr/sbin/system-install-packages", line 244, in ?
    main()
  File "/usr/sbin/system-install-packages", line 240, in main
    pkginst.run()
  File "/usr/sbin/system-install-packages", line 230, in run
    self.doRefresh()
  File "/usr/sbin/system-install-packages", line 90, in doRefresh
    self.populatePackages()
  File "/usr/sbin/system-install-packages", line 109, in populatePackages
    po = YumLocalPackage(ts=self.read_ts, filename=pkg)
AttributeError: 'SinglePackageInstaller' object has no attribute 'read_ts'

Local variables in innermost frame:
installs: []
self: <__main__.SinglePackageInstaller object at 0xc705d0>
updates: []
pkg: /home/deji/Desktop/fedora-logos-1.1.53-2.fc6.noarch.rpm
>>

Expected results: 


Additional info: This surely does use to work at least on FC5.