[type/__postgres_conf] Reverse state logic (decide based on source first)

cdist/conf/type/__postgres_conf/explorer/state

@@ -200,23 +200,24 @@ psql_exec 'SELECT 1' >/dev/null || {
 	exit 1
 }
 
-if psql_conf_cmp "${conf_name}" "$(cat "${__object:?}/parameter/value")"
-then
-	echo present
-else
 case $(psql_conf_source "${conf_name}")
 in
 	('')
-			# invalid configuration parameter
-			# (error message was already printed by SHOW command above.
-			#  Yes, it's a hack)
+		printf 'Invalid configuration parameter: %s\n' "${conf_name}" >&2
 		exit 1
 		;;
 	(default)
 		echo absent
 		;;
 	(*)
+		if ! test -f "${__object:?}/parameter/value"
+		then
+			echo present
+		elif psql_conf_cmp "${conf_name}" "$(cat "${__object:?}/parameter/value")"
+		then
+			echo present
+		else
 			echo different
+		fi
 		;;
 esac
-fi