[FIX] web: fix menu app button when menu_id can't be inferred

There used to be no processing done at all when loading the client
from an url missing a menu_id and from which the menu could not
be inferred from the action_id. This resulted in the app name
button in the menu being empty but still present and not bound to
any action. Clicking on it triggered a traceback.

This commit stops ignoring the case when the menu cannot be
inferred from the action and hides the entire menu and submenus
for this particular action. They will be restored when entering
an action from which a proper menu can be inferred.

closes odoo/odoo#27791

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