Issue in function split_read

[chrbianchini]

Hi,
I'm using phaser on the bams from the TCGA dataset and it crashes when the CIGAR string is *. In particular the instruction seq_len = int(number_build) at row 197 of file read_variant_map.py throws a ValueError because the string number_build is empty.
I "fixed" this in my project by returning an empty list if cigar == "*" but maybe it can be handled in a more elegant way.
Greetings,

Christian