If editing credentials for an existing account entry for a hosting

service, and validation fails on any of the fields, the auth form would

be hidden, hiding the fact that anything was wrong.
We now check whether there are any errors to show, and ensure we always

show the form if any are found.

Hit this while testing a change to Bitbucket. Verified that the form

would always show up when triggering a validation failure, but was

otherwise hidden if the fields passed validation.