Provide more informative error message when countMismatches has an ArrayIndexOutOfBoundsException.
Provide more informative error message when countMismatches has an ArrayIndexOutOfBoundsException.

annkupi/picard,nh13/picard,broadinstitute/picard,annkupi/picard,broadinstitute/picard,broadinstitute/picard,nh13/picard,alecw/picard,annkupi/picard,nh13/picard,broadinstitute/picard,alecw/picard,broadinstitute/picard,alecw/picard,alecw/picard,nh13/picard,annkupi/picard