This system message reads: "This user has not specified a valid email address." This info is however not true in all circumstances. It is also shown when a user has indeed provided an e-mail address but did not authenticate it yet, i.e. if $wgEmailAuthentication = true; is set (= default setting).

Instead of rephrasing this system message to e.g "This user has not specified a valid email address or did not authenticate it." I'd rather see a check if an e-mail was provided. If yes display an new message e.g. "This user provided an email address but did not yet authenticate it.", if no display message "Noemailtext".