Made ObjectHelper.notXYZ() more handy so ppl can validate and assign their variables in *one* single line like as 'String foo = ObjectHelper.notEmpty(bar, name)'. This public API change is binary backward compatible.

git-svn-id: https://svn.apache.org/repos/asf/camel/trunk@1436631 13f79535-47bb-0310-9956-ffa450edef68