Fix 'undefined' short error message
Fix 'undefined' short error message

Fixes https://github.com/oVirt/ovirt-web-ui/issues/133

oVirt/ovirt-web-ui,mareklibra/userportal,mareklibra/userportal,oVirt/ovirt-web-ui,mareklibra/userportal,oVirt/ovirt-web-ui,mareklibra/userportal