collections like context.selected_objects no longer return None for empty lists. Update scripts for this.
also removed check for obj.data == None for a mesh. This will never happen.

commit 27934 by DingTo: Improved Addons in User Prefs by Keith Boshoff (wahooney) This adds a "description" field to addons (ideally a small 1 liner, with basic info)

[[Split portion of a mixed commit.]]