Raise ValueError when iteration hits a truncated line rather than silently exiting.
Raise ValueError when iteration hits a truncated line rather than silently exiting.

TyberiusPrime/pysam,TyberiusPrime/pysam,brendanofallon/pysam,nlhepler/pysam,brendanofallon/pysam,kyleabeauchamp/pysam,daler/pysam,brendanofallon/pysam,carolinux/pysam,kyleabeauchamp/pysam,daler/pysam,carolinux/pysam,pysam-developers/pysam,nlhepler/pysam,brendanofallon/pysam,bioinformed/pysam,dannon/pysam,TyberiusPrime/pysam,nlhepler/pysam,bioinformed/pysam,kyleabeauchamp/pysam,bioinformed/pysam,carolinux/pysam,daler/pysam,bioinformed/pysam,mattions/pysam,nlhepler/pysam,carolinux/pysam,mattions/pysam,dannon/pysam,TyberiusPrime/pysam,carolinux/pysam,TyberiusPrime/pysam,daler/pysam,bioinformed/pysam,kyleabeauchamp/pysam,pysam-developers/pysam,mattions/pysam,brendanofallon/pysam,dannon/pysam,mattions/pysam,dannon/pysam,kyleabeauchamp/pysam,nlhepler/pysam,mattions/pysam,pysam-developers/pysam,pysam-developers/pysam,daler/pysam,dannon/pysam