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.
This is closer to what we need, at least for custom fields. However this will only work for the example matter having the custom fields set. Instead maybe we should populate this custom fields hash from the actual custom fields end point and populate each one (value from matter if set, null otherwise).