Steps to reproduce the issue

Enter invalid mysqli credentials within configuration.php

Expected result

a http 500 status to be returned

Actual result

a 200 status is returned, along with the word "Error".

System information (as much as possible)

has been tried on multiple systems include a plesk setup, and cpanel.

Additional comments

RuntimeExceptions created by JDatabaseExceptionConnecting dont appear to be handled by the catch statement in the parent driver class.