If a moap entry has EnableWhiteList but WhiteList == null, then properly block the request instead of throwing an exception.

Normally, WhiteList is an empty list but from Mantis 7389 it looks like it might sometimes be possible for it to be null (haven't seen this up till now)
It looks like failing with an exception instead of properly replying to the request (which comes in via a cap) might be enough, surprisingly, to freeze a viewer until timeout.
Part of http://opensimulator.org/mantis/view.php?id=7389 but probably unrelated to the actual issue of that mantis.
Update libomv to grab latest bug fixes for Collada upload.
Revert "Update libomv to grab latest bug fixes for Collada upload."

This reverts commit 4c0745b58986e529e3222fcb39a0cfad3bc878c4.
Merge branch 'master' of ssh://opensimulator.org/var/git/opensim
Updated libomv to grab the latest bug fixes in Collada upload
Allow for richer semantics of object derez. Specifically, allow the existence of region modules that do other kinds of garbage collection. Instead of placing deleted objects in the user's Trash folder, or deleting them immediately (UseTrashOnDelete = false), a module may decide to take garbage collection under its control. For example, it may place derezzed objects in a certain area inworld and delete them later.