Index: openacs-4/packages/xowiki/tcl/form-field-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/form-field-procs.tcl,v
diff -u -N -r1.284.2.147 -r1.284.2.148
--- openacs-4/packages/xowiki/tcl/form-field-procs.tcl	9 Feb 2021 11:16:22 -0000	1.284.2.147
+++ openacs-4/packages/xowiki/tcl/form-field-procs.tcl	17 Feb 2021 09:30:12 -0000	1.284.2.148
@@ -774,13 +774,13 @@
   FormField instproc answer_check=lt {} {
     set d [:process_correct_when_modifier]
     dict with d {
-      return [expr {$value < [lindex $words 0]}]
+      return [expr {$value ne "" && $value < [lindex $words 0]}]
     }
   }
   FormField instproc answer_check=le {} {
     set d [:process_correct_when_modifier]
     dict with d {
-      return [expr {$value <= [lindex $words 0]}]
+      return [expr {$value ne "" && $value <= [lindex $words 0]}]
     }
   }
   FormField instproc answer_check=btwn {} {