dc-js/dc.js — pull request #683 by dimirc (2014-08-26 05:59:38+00:00)
Title: Row Chart: optionally ignore values that are zero

I see that there are some [hacky proposals](https://groups.google.com/forum/#!topic/dc-js-user-group/UERVo4QGX7w) if users need to prevent having rows (elements) that appear with data.value = 0

This PR introduces `chart.ignoreZeroValue(true)` to enable this functionality