Removes warning about missing content definition
Removes warning about missing content definition

With nested elements, it's absolutely ok to have no contents for an element. So why warn the user about it?

mamhoff/alchemy_cms,akra/alchemy_cms,chalmagean/alchemy_cms,mixandgo/alchemy_cms,mtomov/alchemy_cms,IngoAlbers/alchemy_cms,nielspetersen/alchemy_cms,nielspetersen/alchemy_cms,robinboening/alchemy_cms,AlchemyCMS/alchemy_cms,mixandgo/alchemy_cms,IngoAlbers/alchemy_cms,akra/alchemy_cms,AlchemyCMS/alchemy_cms,IngoAlbers/alchemy_cms,chalmagean/alchemy_cms,nielspetersen/alchemy_cms,chalmagean/alchemy_cms,chalmagean/alchemy_cms,mtomov/alchemy_cms,robinboening/alchemy_cms,mixandgo/alchemy_cms,mtomov/alchemy_cms,nielspetersen/alchemy_cms,IngoAlbers/alchemy_cms,mixandgo/alchemy_cms,akra/alchemy_cms,mamhoff/alchemy_cms,mtomov/alchemy_cms,mamhoff/alchemy_cms,robinboening/alchemy_cms,AlchemyCMS/alchemy_cms,akra/alchemy_cms