Single AD connection without domain shows undefined in message

[hzalaz]

When the client only allows a single AD connection, Lock will display the form for username/password with the title Please enter your coorporate credentials at {domain}. We need to avoid showing the undefined by changing the message or hiding for this specific case

[jasonhjohnson]

+1

[sykesjd]

The fix in the linked PR does not actually fully fix the issue - it only checks for null domain and not undefined domain, so the issue as originally described still occurs.