Chat participants cannot receive 'offline message' email notifications

OOB 'Collaboration Offline Group Message(s)' email notifications can't be send to offline chat participants.

1. userA logs in from browserA
2. agentB logs in from browserB
3. userA starts a chat request against a chat queue from virtual agent or from chat queue
i.e. <instancename>/$chat_support.do?queueID=<sysid>
4. agentB accepts the request
5. agentB logs out
6. userA sends messages
7. Wait for collaboration.email_interval (OOB, 3 mins)

Actual behavior:
No email is being sent
Expected behavior:
An email is sent to offline users.

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