Check for nil config in the admin server and return an error.
Check for nil config in the admin server and return an error.

Because Go's template renderer streams retults as it renders, an error
will not be determined until after the 200 OK has been sent. To
alleviate this problem, a nil check is done prior to rendering, in
which case a 500 error is returned immediately.

wallaceicy06/muni-sign,wallaceicy06/muni-sign,wallaceicy06/muni-sign