Changed the result to look at whether the array actually had a length as on testing I found that it always said "1 PRs closed" when closing a failing PR.

assume an array will always be returned

the array length needs to be checked as an array that is empty will be returned by the reduce and promise all combination

Change code per suggestions. Using ?

Optional chaining was available from node 14 onwards, we still support node 12 and so although I'm happy with the change we would have to stop supporting node 12.