Description of problem:

Attempting to display the repo list fails (with a 500 error page or a traceback, depending on server configuration)

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

PulpDist 0.1.0

How reproducible:

Always

Steps to Reproduce:
1. Have a sync job fail with an exception (e.g. local directory already existing)
2. Attempt to display the repo list
  
Actual results:

500 error page or traceback

Expected results:

Repo list displayed

Additional info:

Display code currently assumes that every sync history entry will have a valid "summary" field. This is not a valid assumption - if the job errors outs completely, it may only have error info and no summary.