[TECHNICAL REQUEST] LPS-50114 Social Office Announcement throws exceptions when the announcement creator doesn't exist

Hey Tomcsi,

Could you please check this pull request?
It follows the concept that is used for handling missing users in Message Boads portlet, however since it requires additional logic, the <liferay-ui:user-display /> tag couldn't be applied one on one.

Thanks in advance.

Best regards,
István