[FIX] website: allow editing empty non-arch fields

987fc1190a had added a rule that made
empty fields non-editable so that a snippetless website would not be
editable. This makes empty t-fields non-editable as well which is - to
say the least - not welcome.
This commit fixes that problem by making the rule more restrictive: what
we don't want to be able to edit are empty _arch_ field specifically.

closes odoo/odoo#71718

X-original-commit: 6886c2a2a2ad47d1150dd072888c39ccfb59b163
Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>

addons/website/static/src/js/menu/edit.js

@@ -305,7 +305,7 @@ var EditPageMenu = websiteNavbarData.WebsiteNavbarActionWidget.extend({
     },
 
     _getContentEditableAreas () {
-        return $(this.savableSelector).not('input, [data-oe-readonly],[data-oe-type="monetary"],[data-oe-many2one-id], :empty').filter((_, el) => {
+        return $(this.savableSelector).not('input, [data-oe-readonly],[data-oe-type="monetary"],[data-oe-many2one-id], [data-oe-field="arch"]:empty').filter((_, el) => {
             return !$(el).closest('.o_not_editable').length;
         }).toArray();
     },