$lt null returns true

[KamalAman]

When querying with $lt or $lte, underscore-query returns true for null values.

In javascript:

var a = {test: null};
a.test < 1 == true,

However in mongo:

db.col.insert({"test": null})
//WriteResult({ "nInserted" : 1 })
db.col.find({"test": {$lt: 1}}).count()
//0

[megawac]

Interestingly mongodb doesn't do this with $mod and will treat null as 0 in this case

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