Adding null check for classes with no packages (eg - http://search.maven.org/#search|ga|1|luaj-jse).  This was a problem when packaging liquibase in a fat jar.
Fix for creating a fat jar where classes have no package (see example below).  Also should speed up loading of fat jars in general.

http://search.maven.org/#search|ga|1|luaj-jse
Merge pull request #286 from andersonbd1/master

fix for using in fat jars