`getXValue` fails when x is 0

`getXValue` returns the index when x is specifically 0, because it's falsey. Fixed that by checking the specific case. I have not updated c3.min.js.

`getXValue` fails when x is 0
4206f9d6 · Quim Llimona · e127fb0c · 4206f9d6
Commit 4206f9d6 authored Jun 01, 2014 by Quim Llimona
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c3.js c3.js +1 -1

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--- a/c3.js
+++ b/c3.js
@@ -1403,7 +1403,7 @@
            return xValues;
        }
        function getXValue(id, i) {
-            return id in c3.data.xs && c3.data.xs[id] && c3.data.xs[id][i] ? c3.data.xs[id][i] : i;
+            return id in c3.data.xs && c3.data.xs[id] && (c3.data.xs[id][i] || c3.data.xs[id][i] === 0) ? c3.data.xs[id][i] : i;
        }
        function getOtherTargetXs() {
            var idsForX = Object.keys(c3.data.xs);