Client support for multiple required libraries

features/src/main/javascript/features/opensocial-templates/container.js

 /*
  * Licensed to the Apache Software Foundation (ASF) under one
  * or more contributor license agreements.  See the NOTICE file
  * distributed with this work for additional information
  * regarding copyright ownership.  The ASF licenses this file
  * to you under the Apache License, Version 2.0 (the
  * "License"); you may not use this file except in compliance
  * with the License.  You may obtain a copy of the License at
  *
  *   http://www.apache.org/licenses/LICENSE-2.0
@@ skipping 184 matching lines @@
     }
   }
 };
 
 /**
  * @return {JsEvalContext} the default rendering context to use - this will
  * contain all available data. 
  */
 os.Container.getDefaultContext = function() {
   if ((window['gadgets'] && gadgets.util.hasFeature('opensocial-data')) ||
-      (opensocial.data.getDataContext)) {
+      (opensocial.data && opensocial.data.getDataContext)) {
     return os.createContext(opensocial.data.getDataContext().getData());
   }
   return os.createContext({});
 };
 
 /**
  * Renders any registered inline templates.
  * @param {Object} opt_doc Optional document to use instead of window.document.
  */
 os.Container.renderInlineTemplates = function(opt_doc) {
@@ skipping 285 matching lines @@
     if (tagParts.length == 2) {
       var nsObj = os.getNamespace(tagParts[0]);
       if (!nsObj) {
         // Auto Create a namespace for lazy registration.
         nsObj = os.createNamespace(tagParts[0], null);
       }    
       nsObj[tagParts[1]] = os.createTemplateCustomTag(template);
     }
   }
 };