Index: openacs-4/packages/acs-admin/www/apm/packages-install.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-admin/www/apm/packages-install.tcl,v
diff -u -r1.27 -r1.28
--- openacs-4/packages/acs-admin/www/apm/packages-install.tcl	25 Apr 2018 19:23:25 -0000	1.27
+++ openacs-4/packages/acs-admin/www/apm/packages-install.tcl	9 May 2018 15:33:28 -0000	1.28
@@ -135,9 +135,9 @@
 
     ad_set_client_property -clob t apm spec_files $spec_files
 
-    set errors {}
-    set pkg_info_list {}
-    set pkg_key_list {}
+    set errors [list]
+    set pkg_info_list [list]
+    set pkg_key_list [list]
     apm_log APMDebug "APM: Specification files available: $spec_files"
     foreach spec_file $spec_files {
         ### Parse the package.