Use geojson file to also display VACANT committee seats

[pwolanin]

Use the geojson file or any other current source to generate a file to upload to contentful for the committee person seats where all are named VACANT

[pwolanin]

Instead of generating them and filling them in contentful, maybe easier to simply fill in the missing ones dynamically?

The committee person list is displayed on https://github.com/CodeForPhilly/philly-ward-leaders/blob/master/src/views/ward-leader.vue

We load the map of each ward with the divisions from the pre-split files like:
https://raw.githubusercontent.com/CodeForPhilly/philly-ward-leaders/master/public/data/ward-boundaries/18.geojson

From that data we can find a count/identity of the divisions. Use that count instead of the count coming from the ward leader record. Fill in a default blank record for each committee person and then replace it if data comes from the API.

We need to figure out a better system for managing the sub-ward data - basically we just need a data file for DEM/REP where wards with sub-wards are populated with the division lists. With this we should filter the division list form the geojson