Hash array fix

poll now able to get all custom_fields and activities.
If you look at it in Zapier it's kind of awkward as certain custom fields and activities are only in certain matters, so for example if you select "Activity Rates Alec Clarke rate/hr" in the drop down, and the matter doesn't have that activity in it, the content you would send would be  {{activity_rates__Alec Clarke rate/hr}} not "500" as it should be.

**you can have an existential filter that can deal with the ^ issue.
I can't see a way of having activity rates working as we expect it to, maybe lets just remove it for now.