Fixed Bug 7926

Login server will now reject login requests with empty userids.
Special Thanks to Haruna, Kisuka!
http://hercules.ws/board/tracker/issue-7926-login-and-password-empty/

Signed-off-by: shennetsind <ind@henn.et>
Fixed Bug 8186

Fixed issue with @disguise characters crashing their party mates when they open the party window.
Related 4147d9f7966e7ebd94811248527cc45af1e54941
http://hercules.ws/board/tracker/issue-8186-client-crashes-in-disguise-and-who/

Signed-off-by: shennetsind <ind@henn.et>