Remove user|passoword from smtp disable check

[mirestrepo]

Not all email-relays need this

xnat/docker-entrypoint.sh

Line 72 in b674df3

if [ -z "${XNAT_SMTP_HOSTNAME}" ] || [ -z "${XNAT_SMTP_USER}" ] \

[mirestrepo]

The script is partly right...

if the user|password is empty we should still disable, but the if else logic may be more complex. We may still need the host Information in the configuration if there is one