NoopQuery elements result in invalid query bodies

[KGoodale13]

Currently using the NoopQuery value results in an invalid query body being generated. This is because NoopQuery values become empty objects in the body.

Example:

{
    "bool": {
        "should": [
           {}
        ]
    }
}

Instead I believe NoopQuery values should be removed from the body entirely, because an empty condition array is still a valid query.

Example:

{
    "bool": {
        "should": [
        ]
    }
}

[stale]

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