test empty/blank explicitly as field name arguments, remove unused assertions (those which handle result values from methods invoke with the intent of raising exceptions)

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@1531401 13f79535-47bb-0310-9956-ffa450edef68
a bit of dog food and a lot of javadoc tweakage

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@1531403 13f79535-47bb-0310-9956-ffa450edef68