fixed a bug when coordinate-less reads are on the reverse strand
fixed a bug when coordinate-less reads are on the reverse strand

AngieHinrichs/samtabix,AngieHinrichs/samtabix,lh3/samtools,lh3/samtools,AngieHinrichs/samtabix,lh3/samtools,AngieHinrichs/samtabix,AngieHinrichs/samtabix