Fix bug 19001.  Don't allow empty prefixes.
Fix bug 19001.  Don't allow empty prefixes.

Thanks to Andrew Vardeman for the patch.


git-svn-id: 8699849808240b02471d01f5aaa03ec0c1cb68ee@249123 13f79535-47bb-0310-9956-ffa450edef68

apache/axis1-java,apache/axis1-java,apache/axis1-java,apache/axis1-java