Disable default output error for EXPIRATION_EARLY

[polettix]

This patch extends the disabling of an output error associated to EXPIRATION_EARLY that is currently enjoyed only when a configuration file is passed. In other terms, when no configuration file is set, any error is returned as error code 1.

This change makes the script backwards compatible with a previous version of the client, e.g. the client in version 0.17 had this behaviour.