mapbox/tilelive.js — pull request #66 by mojodna (2014-03-17 22:23:47+00:00)
Title: Treat null / undefined tile data as a skip

This allows tilelive sources to pass `null` / `undefined` when tiles don't
exist rather than an un-subclassed `Error` with a specific message (where
detection is more brittle).

/cc @gravitystorm