Fix d4_interval_coverage endpoint crashing with provided MT chromosome and chrM d4 files
[3.5.1]
Fixed
d4_interval_coverageendpoint crashing when computing stats over theMTinterval, when d4 file containschrMchromosome (Nallo pipeline)
d4_interval_coverage endpoint crashing when computing stats over the MT interval, when d4 file contains chrM chromosome (Nallo pipeline)