mapbox/geojson.io — pull request #389 by rfox90 (2014-11-12 20:13:32+00:00)
Title: Check if we have some feature properties before trying to manipulate them

I was working with a file that had no feature properties and coerceNum fails.

This bubbles up the stack to a try/catch around the JSON parsing incorrectly informing me that my geojson is invalid.