throwIfNullUndefined = function(value) {
    if (value === undefined || value === null) {
      thisInterpreter.throwException(thisInterpreter.TYPE_ERROR,
          "Cannot convert '" + value + "' to object");
    }
  }
Checks if the provided value is null or undefined.
If so, then throw an error in the call stack.
@param {Interpreter.Value} value Value to check.