[FIX] web: avoid popover crash in iframe

This commit solves a crash which can happen when a popover points to an
element inside an iframe that has been removed from the DOM. In those
cases, the element's ownerDocument does not have a defaultView.

closes odoo/odoo#151235

X-original-commit: 1ccebdbd2fcc6875173b02a31d89f3c2e9ffbfec
Signed-off-by: Samuel Degueldre (sad) <sad@odoo.com>

addons/web/static/src/core/popover/popover.js

@@ -145,8 +145,12 @@ Popover.props = {
         validate: (target) => {
             // target may be inside an iframe, so get the Element constructor
             // to test against from its owner document's default view
-            const Element = target?.ownerDocument?.defaultView.Element;
-            return Boolean(Element) && (target instanceof Element || target instanceof window.Element);
+            const Element = target?.ownerDocument?.defaultView?.Element;
+            return (
+                (Boolean(Element) &&
+                    (target instanceof Element || target instanceof window.Element)) ||
+                (typeof target === "object" && target?.constructor?.name?.endsWith("Element"))
+            );
         },
     },
     slots: {