Fix NoneType + int when `calculated_difficulty` is `None`

vijos / vj4

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Fix NoneType + int when `calculated_difficulty` is `None` #643

Closed twd2 closed 1 year ago

twd2 commented 1 year ago

When a problem has no submission, its calculated difficulty is None, and an error will occur when it is added with difficulty_admin to calculate the average difficulty. Use difficulty_admin in this situation.