fixed check design error

workflow/scripts/check_design.py

@@ -181,6 +181,24 @@ def check_files(design, fastq, paired):
     return design
 
 
+def get_length(checked_design_df):
+    '''Adds length of reads to design file.'''
+
+    logger.info("Adding read length to design file.")
+
+    fq_len_list = []
+
+    files = checked_design_df['fastq_read1']
+
+    for f in files:
+        len_fq = os.popen("zcat %s | head -n 2 | tail -n 1 | wc -c " % (f)).read().rstrip()
+        fq_len_list.append(len_fq)
+
+    checked_design_df['fq_length'] = fq_len_list
+
+    return checked_design_df
+
+
 def main():
     args = get_args()
     design = args.design