error class is lost on base node title during form validation

When the title of the base node is left empty and the node form is submitted, the "error" class should be set on the node title (#edit-title) field. If one or more fields is filled out in the node widget, then the validation error "Title field is required." still appears in $messages, but the error class is not set on the title field.

This creates a usability problem, particularly as there may be multiple "Title" fields appearing on the same page.