Fix ATS handling in tags that NAK RATS #174
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pcd_14a_reader_ats_request didn't check for NAK so in case the tag NAKd the RATS it would return a zero length ATS which would cause an underflow in pcd_14a_reader_scan_once, that in turn resulted in HF_ERR_ATS being returned due to an invalid ATS length.
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pcd_14a_reader_ats_requestdidn't check for NAK so in case the tag NAKd the RATS it would return a zero length ATS which would cause an underflow inpcd_14a_reader_scan_once, that in turn resulted inHF_ERR_ATSbeing returned due to an invalid ATS length.