fixes for WCM-511 and WCM-512

- preserve anchor (#anchor) urls in tinymce
- better error handling in file picker widget
- disabling next while in the midst of adding a rendering engine (usability fix)

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@6058 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/web/scripts/ajax/file_picker_widget.js

@@ -427,6 +427,11 @@ _showPicker: function(data)
                               "xformsRow" + (i % 2 ? "Even" : "Odd"));
     this.contentDiv.appendChild(row);
   }
+  
+  if (data.getAttribute("error") && data.getAttribute("error").length != 0)
+  {
+    this._showStatus(data.getAttribute("error"), true);
+  }
 },
 
 _createRow: function(fileName, webappRelativePath,  isDirectory, fileTypeImage, rowClass)