MDL-19030 even uglier hack - do not try to add id to labels of static element...

MDL-19030 even uglier hack - do not try to add id to labels of static element - they do not have it; merged from MOODLE_19_STABLE

lib/pear/HTML/QuickForm/Renderer/Tableless.php

@@ -186,7 +186,7 @@ class HTML_QuickForm_Renderer_Tableless extends HTML_QuickForm_Renderer_Default
             } else {
                 $id = $element->getName();
             }
-            if (!empty($id) and !$element->isFrozen() and !is_a($element, 'MoodleQuickForm_group')) { // moodle hack
+            if (!empty($id) and !$element->isFrozen() and !is_a($element, 'MoodleQuickForm_group') and !is_a($element, 'HTML_QuickForm_static')) { // moodle hack
                 $html = str_replace('<label', '<label for="' . $id . '"', $html);
                 $element_html = preg_replace('#name="' . $id . '#',
                                              'id="' . $id . '" name="' . $id . '',