[FIX] web: cherry-pick of 893e426 & 61207f3

Author: beledouxdenis

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

@@ -2249,7 +2249,10 @@ instance.web.form.ReinitializeWidgetMixin =  {
 instance.web.form.ReinitializeFieldMixin =  _.extend({}, instance.web.form.ReinitializeWidgetMixin, {
     reinitialize: function() {
         instance.web.form.ReinitializeWidgetMixin.reinitialize.call(this);
-        this.view.render_value_defs.push(this.render_value());
+        var res = this.render_value();
+        if (this.view && this.view.render_value_defs){
+            this.view.render_value_defs.push(res);
+        }
     },
 });