[java/cs] Expression Unwrap fix


git-svn-id: http://haxe.googlecode.com/svn/trunk@6531 f16182fa-f095-11de-8f43-4547254af6c6
do not assertion fail on abstract field access (can happen in untyped code)

git-svn-id: http://haxe.googlecode.com/svn/trunk@6532 f16182fa-f095-11de-8f43-4547254af6c6