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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def convert_to_flat(self, builder):
 """ In this conversion, we always want to return a valid flatbuffer pointer even if all the contents are blank because sometimes we need to put empty boost states into the boost list to make the indices line up. """


        DesiredBoostState.DesiredBoostStateStart(builder)
        if self.respawn_time is not None:
            DesiredBoostState.DesiredBoostStateAddRespawnTime(builder, Float.CreateFloat(builder, self.respawn_time))
        return DesiredBoostState.DesiredBoostStateEnd(builder)