Throw exception on no cert in SA client.
Throw exception on no cert in SA client.

The call cannot proceed, so throw an exception to make it easier to
track down the root cause.

charliemeyer/geni-portal,charliemeyer/geni-portal,charliemeyer/geni-portal,charliemeyer/geni-portal,tcmitchell/geni-portal,tcmitchell/geni-portal,tcmitchell/geni-portal,tcmitchell/geni-portal,charliemeyer/geni-portal,tcmitchell/geni-portal