Account for +1s with conditions

Wayne: "I don't know if there is currently a bug open for it but: Trestle does not take into account +1 with a checklist. I think we have started using this more often, so it would probably be a good thing to try to support."
HD: "how do you think that should be shown?"
Wayne: "I'm not sure. I think it might be that it should just not count as a +1 until the checks are filled in."

- [ ] Showing a checklist (required to work in order for us to take task lists into account)

<!-- TRESTLE
{"columnWeight":0,"milestoneWeight":-918}
-->