Don't show 'latest version is ...' until latest version is available

Signed-off-by: Richard Mansfield <richardm@catalyst.net.nz>

htdocs/lib/registration.php

@@ -236,18 +236,20 @@ function site_statistics($full=false) {
     $data['name']        = get_config('sitename');
     $data['release']     = get_config('release');
     $data['version']     = get_config('version');
-    $data['latest_version'] = get_config('latest_version');
     $data['installdate'] = format_date(strtotime(get_config('installation_time')), 'strftimedate');
     $data['dbsize']      = db_total_size();
     $data['diskusage']   = get_field('site_data', 'value', 'type', 'disk-usage');
     $data['cronrunning'] = !record_exists_select('cron', 'nextrun < CURRENT_DATE');
 
-    if ($data['release'] == $data['latest_version']) {
-        $data['strlatestversion'] = get_string('uptodate', 'admin');
-    }
-    else {
-        $download_page = 'https://launchpad.net/mahara/+download';
-        $data['strlatestversion'] = get_string('latestversionis', 'admin', $download_page, $data['latest_version']);
+    if ($latestversion = get_config('latest_version')) {
+        $data['latest_version'] = $latestversion;
+        if ($data['release'] == $latestversion) {
+            $data['strlatestversion'] = get_string('uptodate', 'admin');
+        }
+        else {
+            $download_page = 'https://launchpad.net/mahara/+download';
+            $data['strlatestversion'] = get_string('latestversionis', 'admin', $download_page, $latestversion);
+        }
     }
 
     $data['strrankingsupdated'] = get_string('rankingsupdated', 'admin', date('Y-m-d H:i', get_config('registration_lastsent')));

htdocs/theme/raw/templates/admin/stats.tpl

@@ -26,7 +26,7 @@
     {if $sitedata.diskusage}
     <p><strong>{str tag=diskusage section=admin}:</strong> {$sitedata.diskusage|display_size}</p>
     {/if}
-    <p><strong>{str tag=maharaversion section=admin}:</strong> {$sitedata.release} ({$sitedata.strlatestversion})</p>
+    <p><strong>{str tag=maharaversion section=admin}:</strong> {$sitedata.release}{if $sitedata.strlatestversion} ({$sitedata.strlatestversion}){/if}</p>
     <p><strong>{str tag=Cron section=admin}:</strong> {if $sitedata.cronrunning}{str tag=runningnormally section=admin}{else}{str tag=cronnotrunning section=admin}{/if}</p>
   </div>
 <div class="cb"></div>