Can't edit page when watchers include an LDAP user without an email address

This also causes the notification itself to fail.

Please see corresponding support ticket : CSP-5284

2006-09-21 00:00:22,697 ERROR [org.quartz.core.ErrorLogger] java Job (DEFAULT.DailyReportJob threw an exception.
org.quartz.SchedulerException: Job threw an unhandled exception. [See nested exception: java.lang.IllegalArgumentException: user ngomes has null email address for mail notification item with subject Confluence Changes in the last 24 hours]

Please confirm if this is indeed a bug.

Thanks,
Ivan