Bugfix: http://pastebin.com/F13Axnyy

Additional null checking resources related to Ambient Occlusion.

Signed-off-by: Mike Howe <dockter@almuramc.com>
Bugfix for: https://spoutdev.atlassian.net/browse/LEGACY-612

Please report again if you see this error.

Signed-off-by: Mike Howe <dockter@almuramc.com>
Merge branch 'master' of Legacy/Spoutcraft into neko-dev