erp5_notebook: notebook execution continues after cell errors

bt5/erp5_notebook/SkinTemplateItem/portal_skins/erp5_notebook/gadget_jsmd_eval.js.js

@@ -518,7 +518,17 @@
 
   function deferCellExecution(cell) {
     return function () {
+      return new RSVP.Queue()
+        .push(function () {
           return executeCell(cell);
+        })
+        .push(undefined, function (error) {
+          //errors in cell execution must be part of the notebook result
+          //notebook execution must continue
+          var pre = document.createElement('pre');
+          pre.textContent = error;
+          document.body.appendChild(pre);
+        });
     };
   }