Chartjs-Chartjs add dataset class stops drag plugin from working

Turns out it was the way i was defining my data.
The check was for a weak array and passing it an empty value wasn’t what it was expecting.

And also in the way i was adding data, i should have stuck to adding it in seconds.

          data: [
            arrayToDate([
              "08:25", "08:39"
            ]),
            arrayToDate([
              "09:45", "09:55"
            ]),
            [undefined, undefined],
            [undefined, undefined],
            [undefined, undefined],
            [undefined, undefined],
            [undefined, undefined]
          ],

https://jsfiddle.net/wo9zku6s/16/ is the working result.