[MERGE] [FIX] FormView: avoid multiple creations of the same line in …

…o2m fields when the save action fails (e.g. forgot one required field)

This is done by removing the added action 'prepend_on_create' that can be present as many time as we pressed the save button

lp bug: https://launchpad.net/bugs/1265705 fixed

bzr revid: mat@openerp.com-20140414081003-290q4v21q01m4rsi

addons/web/static/src/js/view_form.js

@@ -620,6 +620,9 @@ instance.web.FormView = instance.web.View.extend(instance.web.form.FieldManagerM
                         });
                     }
                     return $.when();
+                }).fail(function() {
+                    self.save_list.pop();
+                    return $.when();
                 });
             };
             return iterate();