Indices convert wildcards to null

[mtdowling]

Give: foo[*].bar[2]
With data:

{
    "foo": [
        {
            "bar": [
                "one",
                "two"
            ]
        },
        {
            "bar": [
                "three",
                "four"
            ]
        },
        {
            "bar": [
                "five"
            ]
        }
    ]
}

The compliance tests say the results should be null. However, I think it should be an empty list because a result of a wildcard projection should not convert the wildcard root result to null.

From the docs:

Note that if any subsequent expression after a wildcard expression returns a null value, it is omitted from the final result list.

[mtdowling]

Fixed in #23