Fixes a bad optimization that completely pruned empty try blocks, even if they had non-empty finally blocks that needed to be run.

Found by: knorton
Patch by: alex.tkachman (+scottb)
Review by: mmendez (desk check), scottb


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@1004 8db76d5a-ed1c-0410-87a9-c151d255dfc7