AssetAPI: Fix crash on accessing null asset ptr for bundle transfer. Fix crash on iterating factory extensions.
AssetAPI: Fix crash on accessing null asset ptr for bundle transfer. Fix crash on iterating factory extensions.

realXtend/tundra-urho3d,realXtend/tundra-urho3d,realXtend/tundra-urho3d,realXtend/tundra-urho3d,realXtend/tundra-urho3d