add check in output to make avoid NaNs in summary file

    size_t num_lowmapq = counts[SUMMARY_METADATA_LOWMAPQ];

    size_t num_cachehit = counts[SUMMARY_METADATA_CACHEHIT];

    double fric = (double) num_cachehit / (double) num_mapped;

    double fric = (num_mapped != 0) ? (double) num_cachehit / (double) num_mapped : 0.0;

    size_t num_cache_slots = counts[SUMMARY_METADATA_CARDINALITY];

    // compute the estimated frip

    double est_frip = frip_est_coeffs[0] + /* constant */

    double est_frip = (fric != 0.0) ? frip_est_coeffs[0] + /* constant */

                      (frip_est_coeffs[1] * fric) +

                      (frip_est_coeffs[2] * num_dup) +

                      (frip_est_coeffs[3] * num_unmapped)  +

                      (frip_est_coeffs[4] * num_lowmapq);

                      (frip_est_coeffs[4] * num_lowmapq) : 0.0;

    // print out data for current barcode

    if (!output_num_cache_slots_info) {