Index: openacs-4/contrib/packages/simulation/tcl/action-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/contrib/packages/simulation/tcl/Attic/action-procs.tcl,v
diff -u -r1.3 -r1.4
--- openacs-4/contrib/packages/simulation/tcl/action-procs.tcl	9 Dec 2003 15:58:12 -0000	1.3
+++ openacs-4/contrib/packages/simulation/tcl/action-procs.tcl	10 Dec 2003 16:06:46 -0000	1.4
@@ -21,10 +21,13 @@
     
     db_transaction {
         if { [info exists row(recipient_role)] } {
-            set recipient_role_id [workflow::role::get_id \
-                                       -workflow_id $workflow_id \
-                                       -short_name $row(recipient_role)]
-            
+            if { ![empty_string_p $row(recipient_role)] } {
+                set recipient_role_id [workflow::role::get_id \
+                                           -workflow_id $workflow_id \
+                                           -short_name $row(recipient_role)]
+            } else {
+                set recipient_role_id [db_null]
+            }
             db_dml edit_sim_role {
                 update sim_tasks
                 set    recipient = :recipient_role_id