Do not hide exceptions catched by ErrorNotificator, reraise CannotNotifyError, use in CLI
Please review: @jziebinski @msobczyk
Also get rid of the additional is_in_dev_mode logic, because errors are logged out anyway.
This allows us to use ErrorNotificator logic of changing the exception message to be used in CLI.
Previously ErrorNotificator couldn't be used in CLI as it would result in hidden exceptions.
E.g. previously:
now:
Edited by Mateusz Żebrak