Add "empty" bins to a kusto query

kusto-null-bins

let Start=startofday(ago(2d));
let Stop=startofday(ago(1d));
requests
  | where timestamp >= Start and timestamp < Stop 
  | summarize Count=count() by bin(timestamp, 1h)
  | union (
        range x from 1 to 1 step 1
        | mv-expand timestamp=range(Start, Stop, 1h) to typeof(datetime)
        | extend Count = 0
        )
  | summarize Count = sum(Count) by bin(timestamp, 1h)