Description of problem:
Using "-packagename" to exclude packages in %packages section of 
kickstart scripts doesn't work anymore and creates an unhandled exeption.

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


How reproducible:
Always

Steps to Reproduce:
1. Exclude a package with "-packagename" in a kickstart script.
2. Start a kickstart installation.
  
Actual results:
Unhandled exception.

Expected results:
Package excluded from install.

Additional info: I used PXE boot and pulled the kickstart from a http server.