[OSG] Laying down a torch makes it disappear

Laying down a torch, e.g. "torch_128" in the OSG version of OpenMW makes it disappear.

Steps to reproduce:

1. player->additem torch_128 1
2. Open inventory and move torch out of the window
3. Close inventory and observe

OpenMW version: Latest 64bit OSG version by Ananace

(RM-2700 from redmine: created on 2015-06-17 by Thomas Staudinger, , closed on 2015-06-17 by scrawl .)