Index: openacs-4/packages/acs-admin/www/install/install-3.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-admin/www/install/install-3.tcl,v
diff -u -r1.9 -r1.9.10.1
--- openacs-4/packages/acs-admin/www/install/install-3.tcl	10 Jan 2007 21:22:00 -0000	1.9
+++ openacs-4/packages/acs-admin/www/install/install-3.tcl	27 Aug 2013 11:44:43 -0000	1.9.10.1
@@ -54,7 +54,7 @@
     array unset version
     array set version $repository($package_key)
     
-    if { [exists_and_not_null version(download_url)] } {
+    if { ([info exists version(download_url)] && $version(download_url) ne "") } {
         set spec_file [apm_load_apm_file -url $version(download_url)]
         if { $spec_file eq "" } {
             ns_log Error "Error downloading package $package_key from $version(download_url). Installing package failed."