Fix record missing key's error

[scottming]

exception #=> %ArgumentError{message: "record :user does not have the key: :email"}

[test/lexical/remote_control/build/error_test.exs:436: Lexical.RemoteControl.Build.ErrorTest."test error_to_
diagnostic/3 handles record missing keys error"/1]
stack #=> [
  {Record, :create, 4, [file: 'lib/record.ex', line: 423]},
  {Bar, :user, 1, [file: 'expanding macro']},
  {Bar, :bar, 0, [file: 'nofile', line: 7]}
]

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