Use String#isEmpty() instead of String#length() == 0

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@1489692 13f79535-47bb-0310-9956-ffa450edef68
Statement unnecessarily nested within else clause.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@1489693 13f79535-47bb-0310-9956-ffa450edef68
Statements unnecessarily nested within else clause.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@1489694 13f79535-47bb-0310-9956-ffa450edef68
Statements unnecessarily nested within else clause.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@1489695 13f79535-47bb-0310-9956-ffa450edef68