Update to the test target for emma hosted mode. Plus, added check to not generate class mappings 
if the unit is generated. 


Patch by: amitmanjhi
Review by: jat (desk review)




git-svn-id: https://google-web-toolkit.googlecode.com/svn/releases/1.6@4658 8db76d5a-ed1c-0410-87a9-c151d255dfc7