Description of problem:
If you run check setup and it can;t login to the DB it can get in to an endless loop trying to send mail.

Version-Release number of selected component (if applicable):
5.0

How reproducible:
Tricky?

Steps to Reproduce:
1. run check setup when the db connection gets auto rejected


Actual results:
Deep recursion on subroutine "Bugzilla::dbh" at Bugzilla/Object.pm line 107.
Deep recursion on subroutine "Bugzilla::dbh_main" at Bugzilla.pm line 563.
Deep recursion on subroutine "Bugzilla::DB::connect_main" at Bugzilla.pm line 567.
Deep recursion on subroutine "Bugzilla::DB::_connect" at Bugzilla/DB.pm line 124.
Deep recursion on subroutine "Bugzilla::DB::Pg::new" at Bugzilla/DB.pm line 139.
Deep recursion on subroutine "Bugzilla::DB::db_new" at Bugzilla/DB/Pg.pm line 59.
Deep recursion on subroutine "Bugzilla::Mailer::MessageToMTA" at Bugzilla/DB.pm line 1402.
Deep recursion on subroutine "Bugzilla::User::new" at Bugzilla/Mailer.pm line 138.
Deep recursion on subroutine "Bugzilla::Object::new" at Bugzilla/User.pm line 135.
Deep recursion on subroutine "Bugzilla::Object::_load_from_db" at Bugzilla/Object.pm line 83.

Expected results:


Additional info:
# psql -U db_user --port 9999 -h $db_server $db_name
psql: server closed the connection unexpectedly
	This probably means the server terminated abnormally
	before or while processing the request.