Cannot specify only --trim-n

[necrolyte2]

cutadapt/cutadapt/scripts/cutadapt.py

Line 602 in 3fedb4e

if not adapters and not adapters2 and not cutoffs and \

Needs to have and not options.trim_n added to it otherwise if you invoke cutadapt as follows you will get an error message:

cutadapt --trim-n -o output.fastq trim_me.fastq

cutadapt: error: You need to provide at least one adapter sequence.