CAMEL-6311: DLC should always handle exception. When using a custom onException that may cause DLC to not handle because it didn't do that. So this is now fixed, to ensure always handle when using DLC, as thats the point of this eip.

git-svn-id: https://svn.apache.org/repos/asf/camel/branches/camel-2.10.x@1475660 13f79535-47bb-0310-9956-ffa450edef68