Fix #201: empty email attribute in LDAP causes exception
Fix #201: empty email attribute in LDAP causes exception

We were checking to see if the email attribute had no value, but not to see if it had a non-empty value!

We were making the same mistake with username.

adorton-adobe/user-sync.py,adobe-apiplatform/user-sync.py,adorton-adobe/user-sync.py,adobe-apiplatform/user-sync.py