Description of problem: Yumex hangs while in transaction test part of updating 


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


How reproducible: Attempt to install/upgrade computer via Yumex 


Steps to Reproduce:
1.Launch Yumex 
2. Choose multiple packages to install/ update, add to queue, then click okay
when prompted.
3. Run until Yumex hangs
  
Actual results: 11:14:02 : --> Finished Dependency Resolution
11:14:17 : Downloading Packages:
13:30:57 : Checking GPG Signatures:
13:30:58 : Running Transaction Test
Traceback (most recent call last):
  File "/usr/share/yumex/yumex.py", line 173, in on_queueProcess_clicked
    rc = self.processPackageQueue(self.queue.packages)
  File "/usr/share/yumex/yumex.py", line 622, in processPackageQueue
    quit = self.processTransaction()
  File "/usr/share/yumex/yumex.py", line 660, in processTransaction
    self.yumbase._doTransactionTest()
  File "/usr/share/yumex/yumapi.py", line 338, in _doTransactionTest
    self.populateTs( keepold=0 ) # sigh
  File "/usr/lib/python2.5/site-packages/yum/depsolve.py", line 223, in populateTs
    self.ts.addInstall(hdr, (hdr, rpmfile), txmbr.ts_state)
_rpm.error: adding package to transaction failed




Expected results: No failures


Additional info: