Description of problem:
During kickstart installation when wrong install url is in kickstart, anaconda stops and shows red error message "Closest mirror" but it should show message "Error setting up software source".  

Version-Release number of selected component (if applicable):
F19-Alpha-TC3
anaconda-19.14

How reproducible:
always

Steps to Reproduce:
1. Start kickstart installation, use kickstart with following line:
url --url=http://www.wrong-example.com/19/x86_64/os
  
Actual results:
Anaconda stops and shows red error message "Closest mirror" under label "INSTALLATION SOURCE", have a look at screenshot "wrong-message.png". When you click on "INSTALLATION SOURCE", there isn't URL from kickstart there so you can't modify and correct it. Have a look at screenshot "no-url.png"

Expected results:
Anaconda stops and shows red error message "Error setting up software source" under label "INSTALLATION SOURCE", have a look at screenshot "right-message.png". When you click on "INSTALLATION SOURCE", you can see URL from kickstart and you can modify and correct it. Have a look at screenshot "showed-url.png"


Additional info: