Hello @alex_forrester , I am not sure there is 100% sure fire way to accomplish this. Although, I must say I confused on how students thinking they are failing is better than thinking they are passing. If I was a student and looked in your gradebook, I would have a 0% just because something was not due yet or because you have not graded it??? That would cause a LOT more issues at my institution than students thinking they were passing because something had not been graded. But, if it works for you it works for you.
You can set default grades and then when you grade, change it from the default to the grade you are wanting to give them. That is done by clicking the three dots next to a column in the gradebook and select "set Default Grade".

I would also think you would want to turn on the feature that gives students a zero for anything they don't submit (this would be after the due date obviously, so this does not cover the prior to piece). This is done by clicking the little gear in the upper right corner of the gradebook.

Hope this helps!
Nick
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