Add message for non-implemented schemas

lib/components/JsonSchema/json-schema.html

@@ -1,3 +1,4 @@
+<small *ng-if="errorMessage">{{errorMessage}}</small>
 <div class="params-wrap">
   <div *ng-for="#prop of data.properties" class="param-wrap">
     <div class="param">

lib/components/JsonSchema/json-schema.js

@@ -26,6 +26,7 @@ export default class JsonSchema extends BaseComponent {
     this.data.properties = [];
     if (schema.type !== 'object') {
       // TODO
+      this.errorMessage = 'Non-object (array-based or all-of) schemas are not implemented yet';
       return;
     }
     if (!schema.properties) return;