Ian Ker-Seymer e4dd158b24 Fix out of bounds index access in getLabelMoment ...

Previously, calling getLabelMoment with an out of bound index would cause an
error such as this:

```
Uncaught TypeError: Cannot read property 'null' of undefined
```

This happens because there is not always guaranteed to be a labelMoment on
at the current datasetIndex.

One example of this is practice comes from a this function call:

```js
// since the are not always guaranteed to be at least two labelMoments
//                                \ / this index can be out of bounds
//                                 |
var tickWidth = me.getPixelForTick(1) - me.getPixelForTick(0) - 6;
```

This patch simply ensures that the `labelMoments` for the `datasetIndex` are
defined before accessing properties on it.

2016-07-26 14:45:05 -04:00

13 KiB

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