check empty files

00-rules/filter_samples.smk

@@ -45,6 +45,7 @@ rule clean_pcrerr_samples:
         '''if [[ -s {input} ]] ;
         then obiclean -r {params.r} {input} > {output} 2> {log} ;
         else touch {output} 2> {log} ; fi
+        
         '''
 
 ### Remove sequence which are classified as 'internal' by obiclean