Bug 578258: Calling votes.cgi with no arguments should either display the user's…

template/en/default/global/code-error.html.tmpl

@@ -147,6 +147,11 @@
       address.
     [% END %]
 
+  [% ELSIF error == "extension_disabled" %]
+    [% title = "Extension Disabled" %]
+    You cannot access this page because the extension '[% name FILTER html %]'
+    is disabled.
+
   [% ELSIF error == "extension_must_be_subclass" %]
     <code>[% package FILTER html %]</code> from 
     <code>[% filename FILTER html %]</code> is not a subclass of

votes.cgi

@@ -28,10 +28,11 @@ use lib qw(. lib);
 use Bugzilla;
 use Bugzilla::Error;
 
-my $cgi = Bugzilla->cgi;
+my $is_enabled = grep { $_->NAME eq 'Voting' } @{ Bugzilla->extensions };
+$is_enabled || ThrowCodeError('extension_disabled', { name => 'Voting' });
 
-my $to_url;
-my $action = $cgi->param('action');
+my $cgi = Bugzilla->cgi;
+my $action = $cgi->param('action') || 'show_user';
 
 if ($action eq "show_bug") {
     $cgi->delete('action');