Fixes for using OOPHM while developing a FF plugin, and fixes a case where
getting a property appears to succeed but returns an undefined value.

Patch by: mmstrac
Review by: jat


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@6009 8db76d5a-ed1c-0410-87a9-c151d255dfc7