PAwR response callback not called when there is no response

Hello,

I am using SDK version 2.8.0

When working with the sample periodic_adv_rsp there is a response callback pawr_response. In the documentation it says: 

	 * @param buf  The received data. NULL if the controller reported
	 *             that it did not receive any response.

But when there is no response to a subevent it never calls this callback. Is there a way for me to get a callback when the response slot is emply? Thank you in advance

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