3a2be8e9e0
JIRA: https://jira.spring.io/browse/INT-4336 Don't add "hidden" unreachable methods to the map in the `GatewayProxyFactoryBean`. The methods can never be executed and may not have all expected properties; they should not appear in the graph at all since they are unreachable. Also add defensive coding to the `IntegrationGraphServer` to avoid NPEs when unexpected conditions arise.