$get is throwing error if path does not exist in the $data

[shredmaster]

I use the validator extension and I am getting exception if v-model expression is more than one level ie form.name.

this is the line where exception occurred
if(!vm.$get('validator.'+model))

Base on the documentation, $get method should return undefined instead of throwing an error. I check the exports.$get method and there is no exception handling logic either.

exports.$get = function (exp) {
  var res = expParser.parse(exp)
  if (res) {
          return res.get.call(this, this)
  }
}

why is $get method throwing error in this case?