Index: openacs-4/packages/invoices/lib/projects-billable.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/invoices/lib/projects-billable.tcl,v
diff -u -r1.1 -r1.2
--- openacs-4/packages/invoices/lib/projects-billable.tcl	16 Aug 2005 20:04:31 -0000	1.1
+++ openacs-4/packages/invoices/lib/projects-billable.tcl	13 Oct 2005 17:11:54 -0000	1.2
@@ -26,13 +26,13 @@
     append row_list "$element {}\n"
 }
 
-if {![info exists format]} {
+if {![exists_and_not_null format]} {
     set format "normal"
 }
-if {![info exists orderby]} {
+if {![exists_and_not_null orderby]} {
     set orderby ""
 }
-if {![info exists page_size]} {
+if {![exists_and_not_null page_size]} {
     set page_size "25"
 }