Index: openacs-4/packages/acs-api-browser/tcl/acs-api-documentation-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-api-browser/tcl/acs-api-documentation-procs.tcl,v
diff -u -r1.62 -r1.63
--- openacs-4/packages/acs-api-browser/tcl/acs-api-documentation-procs.tcl	7 Oct 2018 12:10:43 -0000	1.62
+++ openacs-4/packages/acs-api-browser/tcl/acs-api-documentation-procs.tcl	13 Oct 2018 11:40:20 -0000	1.63
@@ -1958,7 +1958,7 @@
             object {show_source 1} {show_methods 1}
         }]
     } else {
-        set url [export_vars -base /api-doc/proc-view {
+        set url [export_vars -base /api-doc/proc-view -no_empty {
             {proc $proc_name} source_p version_id
         }]
     }
Index: openacs-4/packages/acs-api-browser/www/proc-search.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-api-browser/www/proc-search.tcl,v
diff -u -r1.23 -r1.24
--- openacs-4/packages/acs-api-browser/www/proc-search.tcl	17 Jul 2018 13:32:18 -0000	1.23
+++ openacs-4/packages/acs-api-browser/www/proc-search.tcl	13 Oct 2018 11:40:20 -0000	1.24
@@ -174,11 +174,11 @@
 }
 global __csrf_token
 
-set show_deprecated_url [export_vars -base [ad_conn url] -override {{ show_deprecated_p 1 }} {
+set show_deprecated_url [export_vars -base [ad_conn url] -no_empty -override {{ show_deprecated_p 1 }} {
     name_weight doc_weight param_weight source_weight search_type query_string show_private_p __csrf_token
 }]
 
-set hide_deprecated_url [export_vars -base [ad_conn url] -override { { show_deprecated_p 0 } } {
+set hide_deprecated_url [export_vars -base [ad_conn url] -no_empty -override { { show_deprecated_p 0 } } {
     name_weight doc_weight param_weight source_weight search_type query_string show_private_p __csrf_token
 }]
 
@@ -192,10 +192,10 @@
     multirow append private_results $score $proc $args $url
 }
 
-set show_private_url [export_vars -base [ad_conn url] -override { { show_private_p 1 } } {
+set show_private_url [export_vars -base [ad_conn url] -no_empty -override { { show_private_p 1 } } {
     name_weight doc_weight param_weight source_weight search_type query_string show_deprecated_p __csrf_token
 }]
-set hide_private_url [export_vars -base [ad_conn url] -override { { show_private_p 0 } } {
+set hide_private_url [export_vars -base [ad_conn url] -no_empty -override { { show_private_p 0 } } {
     name_weight doc_weight param_weight source_weight search_type query_string show_deprecated_p __csrf_token
 }]
 
Index: openacs-4/packages/acs-api-browser/www/proc-view.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-api-browser/www/proc-view.tcl,v
diff -u -r1.15 -r1.16
--- openacs-4/packages/acs-api-browser/www/proc-view.tcl	17 Jul 2018 21:15:20 -0000	1.15
+++ openacs-4/packages/acs-api-browser/www/proc-view.tcl	13 Oct 2018 11:40:20 -0000	1.16
@@ -138,7 +138,7 @@
         set documentation [api_proc_documentation -script $proc_index]
     }
 }
-set procViewToggleURL [export_vars -base proc-view [list proc [list source_p [expr {!$source_p}]] version_id]]
+set procViewToggleURL [export_vars -base proc-view -no_empty [list proc [list source_p [expr {!$source_p}]] version_id]]
 set setDefaultURL [export_vars -base set-default [list source_p return_url]]
 
 #