webpack/webpack — pull request #413 by hmalphettes (2014-08-19 02:02:41+00:00)
Title: Fix #412 - Support for holes inside Arrays

An array with a hole such as `[,'foo']` is parsed by Esprima as null.
Skip its evaluation.

Reference: https://code.google.com/p/esprima/issues/detail?id=525#c18
```
According to
https://developer.mozilla.org/en-US/docs/SpiderMonkey/Parser_API#Expressions:

interface ArrayExpression <: Expression {
type: "ArrayExpression";
elements: [ Expression | null ];
}
```