skip removing small fastq.gz files after the length filter with --lis…

…t or --sample

modules/filter_fastq_by_length.nf

@@ -31,7 +31,7 @@ process filter_fastq_by_length {
             ;;
         esac
         
-        if [ ${params.samples} == false ]; then
+        if [ ${params.samples} == false ] && [ ${params.list} == false ]; then
             find . -name "${name}_filtered.fastq.gz" -type 'f' -size -1500k -delete
         fi
         """