Index: openacs-4/packages/survey/tcl/survey-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/survey/tcl/survey-procs.tcl,v
diff -u -r1.12 -r1.13
--- openacs-4/packages/survey/tcl/survey-procs.tcl	7 Aug 2017 23:48:29 -0000	1.12
+++ openacs-4/packages/survey/tcl/survey-procs.tcl	25 Apr 2018 19:47:48 -0000	1.13
@@ -226,7 +226,7 @@
 	}
 
 	"checkbox" {
-	    set choices [list]
+	    set choices {}
 	    db_foreach question_choices_3 "" {
 		if { [info exists selected_choices($choice_id)] } {
 		    lappend choices "<input type=checkbox name=$element_name value=$choice_id checked> $label"