[IMP] standalone: log exception when standalone fails

Currently the exception is not logged using the logger meaning that the
only indication of the failure is the "module not loaded" error message.

Catching the exception to log it the proper way will help identifying
the cause of the issue, mainly for uninstall tests.

closes odoo/odoo#100372

Signed-off-by: Xavier Dollé (xdo) <xdo@odoo.com>