[FIX] web: crash when resizing on tablet

When having a long systray (icons from different apps, mode debug,
multi-company...) the resize of the window can trigger a crash for apps
that have not too much top-level menus (e.g. Contacts).

This also happens when loading those apps.

Steps to reproduce (on an iPad, portrait):

* use a Runbot with all modules installed (12.0+)
* activate "debug mode"
* ensure that the menu/systray bar is quite full
* open the "Contacts" app
=> traceback with a "cannot call getBoundingClientRect of undefined"
error

The reason is that the resize's callback iterate over the systray/menu
items to find which one should be folded behind a "more" ("+") menu
item.

Sadly in some cases (combination of screen width, systray size, app's
number of menus) it can lead to a traceback.

This commit ensures that when looping for menu items, we don't try to
reach an non-existing item.

closes odoo/odoo#37329

X-original-commit: odoo/odoo@d7bae03299
Signed-off-by: Adrien Dieudonné (adr) <adr@odoo.com>
Co-authored-by: Romeo Fragomeli <rfr@odoo.com>

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

@@ -537,7 +537,7 @@ var dom = {
             menuItemsWidth += computeFloatOuterWidthWithMargins($extraItemsToggle[0]);
             do {
                 menuItemsWidth -= computeFloatOuterWidthWithMargins($items.eq(--nbItems)[0]);
-            } while (!(maxWidth - menuItemsWidth >= -0.001));
+            } while (!(maxWidth - menuItemsWidth >= -0.001) && (nbItems > 0));
 
             var $extraItems = $items.slice(nbItems).detach();
             $extraItems.removeClass('nav-item');