Created attachment 562200 [details]
run errata - 0 erratas there

Description of problem:
There is a red-alert "undefined method `errors' for #" when for a registered/subscribed system on the errata tab one tries to hit "Run" button.

attached is the screenshot with that.

so please either disable the button on empty errata list or handle it gracefully.

Version-Release number of selected component (if applicable):
katello-0.1.237-1.git.7.752d8de.el6.noarch
katello-cli-0.1.54-1.git.79.17c365f.el6.noarch
pulp-0.0.265-1.el6.noarch
candlepin-0.5.17-1.el6.noarch


How reproducible:
always on recent Katello

Steps to Reproduce:
1.repo sync famous Zoo 
2.get system subscribe to that repo
3.through UI refer to the "Errata" tab for that system.
4. assure that there is no errata for that system available. click "Run" button.
  
Actual results:
red-alert

Expected results:
no errors, system should gracefully respond to that "command" - either disable the button.

Additional info: