Fix property serialization regression.

We need to write a unittest for remoting with
an adapter, that case is only covered by modelview
tests right now. This needs more time, so i don't add
it here as the fix is more important.

Change-Id: I9841f707ca564ffb7fc2e86a7e0605a87637ed25
Reviewed-by: Continuous Integration (KDAB) <build@kdab.com>
Reviewed-by: Brett Stottlemyer <bstottle@ford.com>