--- a/qiime2/qiime_quality-filter_q-score.xml	Mon Aug 05 01:29:30 2019 -0400
+++ b/qiime2/qiime_quality-filter_q-score.xml	Tue Aug 13 07:46:48 2019 -0400
@@ -9,19 +9,19 @@
 
 --i-demux=$idemux
 
-#if $pminquality:
+#if str($pminquality):
  --p-min-quality=$pminquality
 #end if
 
-#if $pqualitywindow:
+#if str($pqualitywindow):
  --p-quality-window=$pqualitywindow
 #end if
 
-#if $pminlengthfraction:
+#if str($pminlengthfraction):
  --p-min-length-fraction=$pminlengthfraction
 #end if
 
-#if $pmaxambiguous:
+#if str($pmaxambiguous):
  --p-max-ambiguous=$pmaxambiguous
 #end if