mbostock/d3 — pull request #905 by muddydixon (2012-11-19 03:14:05+00:00)
Title: Throw exception when invalid value is set to axis.orient

When invalid value is set, d3 does not notify where is wrong.
It informs me "Uncaught TypeError: Cannot call method 'apply' of undefined".
This is not kind for developers.