[FIX] loading: Don't add None to installed apps (#19850)
[FIX] loading: Don't add None to installed apps (#19850)

Previous to this rev., sometimes None could be added
to the list of _init_modules in the registry, this would
then be problematic in ir_http since a sorted would be
performed on this list, which works in py2 but in py3
None and string can't be compared implicitly.
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo