I forget to look this up in our bug tracker today.
I think what I was supposed to be doing was changing it so that if ALL the input grades were null, then the output was null, otherwise if null is treated as 0.
(Rather than the current situation at the OU where if ANY of the input grades are null, the output is null.) I forget what standard Moodle does in this case.
Gradebook
formula behaviour with not submitted assignments
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