EssentialsListComponent should not retrieve beans by default

If you do not configure the path or documenttype parameter of this component, as default the site base folder is choosen as scope, and all beans will be taken into account. Also: if a path cannot be resolved, or there is a typo in the document type name this default is choosen.

I don't see the benefit of this default, in case of mistakes you should be warned about that (error/warning in tomcat log?).

I also think at least path or document type should be entered (add validation).