[FIX] web_editor: reload iframe when header change on controller pages

When a user browses a website, he can visit two types of pages:
- Static page: the page is a website.page record.
- Dynamic / controller page: the page isn't a website.page (e.g. /shop).

Some options are only available on static pages, like the option to
make the header over the content. Since [this other commit], when a user
change the header template, the editor activate/deactivate an extra
options in addition to the header template change. The problem is that
this extra option may be available only on static pages, and the option
to change the header template is available on all pages.

Before this commit, if the extra option is not available, we stop the
process, the page was not reloaded and the user didn't see the new
header template. Now, we just ignore the extra option without stopping
the process, so the page is reloaded and the user see the new header.

Steps to reproduce the issue fixed by this commit:
- Go to /shop
- Edit
- Change the header template

=> The header template is not changed.

[this other commit]: https://github.com/odoo/odoo/commit/e7dcfc19298948b76caa4c214724c93854cf5f4c

task-3572277

closes odoo/odoo#139896

Signed-off-by: Benjamin Vray (bvr) <bvr@odoo.com>

addons/web_editor/static/src/js/editor/snippets.options.js

@@ -4395,11 +4395,10 @@ const SnippetOptionWidget = Widget.extend({
         }
 
         // Check linked widgets: force their value and simulate a notification
+        // It is possible that we don't have the widget, we continue because a
+        // reload might be needed. For example, change template header without
+        // being on a website.page (e.g: /shop).
         const linkedWidgets = this._requestUserValueWidgets(...ev.data.triggerWidgetsNames);
-        if (linkedWidgets.length !== ev.data.triggerWidgetsNames.length) {
-            console.warn('Missing widget to trigger');
-            return;
-        }
         let i = 0;
         const triggerWidgetsValues = ev.data.triggerWidgetsValues;
         for (const linkedWidget of linkedWidgets) {