fixing issue where when one read is shorter than the other before trimming
fixing issue where when one read is shorter than the other before trimming

alliemacleay/SeqPrep,jstjohn/SeqPrep,alliemacleay/SeqPrep,jstjohn/SeqPrep,ofanoyi/SeqPrep,ofanoyi/SeqPrep,alliemacleay/SeqPrep,jstjohn/SeqPrep,ofanoyi/SeqPrep