block show error fixed.

@@ -45,9 +45,9 @@ class block_log extends block_base {
         $this->content->footer = '';
         $this->content->text = '';
         
-        $this->content->text = 'This block shows all cron entries logs.';
         $isadmin   = has_capability('block/log:manageall', context_system::instance());
         if($isadmin) {
+            $this->content->text = 'This block shows all cron entries logs.';
             $this->content->text .= '<br><div><a href="'.$CFG->wwwroot.'/blocks/log/view.php">View cron logs</a></div>';
         }