Index: openacs-4/packages/acs-templating/tcl/tag-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-templating/tcl/tag-procs.tcl,v
diff -u -N -r1.25 -r1.26
--- openacs-4/packages/acs-templating/tcl/tag-procs.tcl	2 Oct 2017 09:25:36 -0000	1.25
+++ openacs-4/packages/acs-templating/tcl/tag-procs.tcl	17 Jan 2018 22:03:53 -0000	1.26
@@ -22,7 +22,7 @@
     # parse simplified conditional expression
     set args [template_tag_if_concat_params $params]
 
-    if {[catch {
+    ad_try {
 
         while { 1 } { 
 
@@ -33,7 +33,6 @@
             if { [llength $args] == 0 } { break }
 
             set conjunction [lindex $args 0]      
-
             switch -- $conjunction {
                 
                 and { append condition " && " }
@@ -48,8 +47,7 @@
             set args [lrange $args 1 end] 
         }
 
-    } errorMsg]} {
-
+    } on error {errorMsg} {
         set condition "$condition_type \{ 1 "
         set chunk $errorMsg
     }