Default for mandrill and sendgrid username to empty string
Default for mandrill and sendgrid username to empty string

Signed-off-by: KheOps <ab12fa204a2b42f5d8c4f486abafbac2ef71cf44@ceops.eu>

hwdsbcommons/eqpress,equalitie/eqpress,equalitie/eqpress,hwdsbcommons/eqpress,hwdsbcommons/eqpress,hwdsbcommons/eqpress,hwdsbcommons/eqpress,equalitie/eqpress,equalitie/eqpress,equalitie/eqpress