Make sure Anitya actually looks at the OpenID errors

This would prevent a redirect loop if the OpenID endpoint
would be broken or unreachable for any of the three
"hardcoded" providers.

Signed-off-by: Patrick Uiterwijk <puiterwijk@redhat.com>
Well, the information is not *too* technical ("discovery failed" most often, but can also be "No such domain" or the like).
Also, note you already do this on line 174.