Return the first value of a particular param by name if it exists otherwise false.

def first_value_of(self, name, default_value = None):
        """
        Return the first value of a particular param by name if it exists otherwise false.
        """
        vals = self.values_of(name)
        if vals is not None:
            return vals if type(vals) is not list else vals[0]
        return default_value