v8.5 should warn you if you try to hit "Send" without a subject.
(well mine does)
The prompt is "Warning: You have not entered a subject for this memo. Do you want to send it without a subject?"
Surely if someone hits "Yes" then they are aware there is no subject.
If you really want to modify your mail template then it would be easy enough to put a check in the Input Validation formula for the subject field (Message form).
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