Adrien Di Mascio <Adrien.DiMascio@logilab.fr> [Fri, 10 Dec 2010 15:47:09 +0100] rev 6742
[registry] backout 120c7ea6e1fa: errors should not pass silently
Catching ImportError silently while loading files has too many side effects.
(e.g. if system hooks / entities can't be registered).