NickAuth: fix leak of information if 'nick list' is used on a user without a configured nick (Closes ProgVal/Limnoria#996)
NickAuth: fix leak of information if 'nick list' is used on a user without a configured nick (Closes ProgVal/Limnoria#996)

Ban3/Limnoria,Ban3/Limnoria,ProgVal/Limnoria-test,ProgVal/Limnoria-test