[FIX] web: view list: ensure that the mutex of synchronized method `reload_content` is always released.
[FIX] web: view list: ensure that the mutex of synchronized method `reload_content` is always released.

havt/openerp-web,havt/openerp-web,havt/openerp-web,akretion/openerp-web,akretion/openerp-web,havt/openerp-web,akretion/openerp-web,havt/openerp-web