vizicities/vizicities — pull request #118 by brianchirls (2014-12-12 21:13:58+00:00)
Title: Don't try to make a model for tiles without any buildings

- Prevents error: "Uncaught TypeError: Cannot read property 'vertexNormals' of undefined"
- Skips some unnecessary code and a worker thread

Error occurred on tiles like this:
http://vector.mapzen.com/osm/buildings/15/9646/12317.json