[FIX] model: The user install / update / test is different from the normal mode (no prefetch in test mode) some errors are hidden.
[FIX] res.users: use read method to compute default values to don't create browse record and fetch all fields, browse record crash for install or update module
[IMP] model: when the orm create/update a table check if they are at least one row of the table to load column default values