Merge pull request #1 from Thermeon/feature/ref_strings

Fix $ref strings treated as objects by JSONEditor

src/main/javascript/view/MainView.js

@@ -74,8 +74,10 @@ SwaggerUi.Views.MainView = Backbone.View.extend({
     // is there any valid case were it should not be added ?
     var def;
     for(def in this.model.definitions){
+      if (this.model.definitions[def].type === null){
         this.model.definitions[def].type = 'object';
       }
+    }
 
   },