Customer set up to email a database agent alert and didn't receive the email. (4302386)

Email alert for an database agent rule sometimes fails to occur. Rule is inconsistent. Email recipient has been specified in the rule.

Missing recipients for rule DBSS - Days Since Last Backup
2011-12-22 11:31:34.298 WARN [Action-4-thread-11731] com.quest.nitro.service.action.ActionService - Failed to invoke action: EmailAction ({foglight_rule_name=DBSS-EmailNotification_Rule_General, event_foglight_severity_level_name=Critical, foglight_rule_id=a2966d29-4029-4d1b-b810-dbd4bde5f20d, event_foglight_rule_name=DBSS - Days Since Last Backup, event_foglight_rule_id=a8cc2cc3-129e-4107-8ee5-5904cda814b2, event_scope=af8624b1-6014-4e3c-a617-7b516abb4bb8, foglight_severity_level_name=Fire} com.quest.nitro.service.action.api.ActionInvocationException: Failed to send email to recipients=, cc=null, bcc=null [org.springframework.mail.MailPreparationException: Could not prepare mail; nested exception is java.lang.NullPointerException]).