Stephen Compall avatar Stephen Compall committed 9bb1efd

Specify that NIL is not a valid widget

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   (:method ((obj symbol)) t)
   (:method ((obj function)) t)
   (:method ((obj string)) t)
+  (:method ((obj null)) nil)
   (:method (obj) nil))
 ;;; Define widget-rendered-p for objects that don't derive from
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