Fix conformance gen output & ERROR_IF test gen

Change conformance gen output when performing --list-tests-to-file
operation to refer it to "Listing" instead of "Creating"

Fix a problem when generating CTS tests using specific profile and
extension options that won't produce ERROR_IF tests - this causes a
generation failure - now the check is ignored if not producing all
tests

Signed-off-by: Jeremy Johnson <jeremy.johnson@arm.com>
Change-Id: Icf2a9cec0253f328a7a95161b1d98282b7cad5f9