[erp5_only_office] catch if onlyoffice.gadget.appcache absence

bt5/erp5_only_office/SkinTemplateItem/portal_skins/erp5_only_office/onlyoffice.gadget.js.js

@@ -335,17 +335,26 @@ DocsAPI.DocEditor.version = function () {
             }
           }
         })
+        .push(function () {
+          return new RSVP.Queue()
             .push(function () {
               return jIO.util.ajax({
                 type: "GET",
                 url: "onlyoffice.gadget.appcache"
               });
             })
+            .push(undefined, function (error) {
+              return;
+            });
+        })
         .push(function (response) {
           /*configure requeryjs for rename
           view and edit to view_folder and edit_folder
           in dependencies
           */
+          if (!response) {
+            return;
+          }
           var text = response.target.responseText,
             relative_url_list = text.split('\r\n'),
             i,