Add validations to avoid NOTICE messages if profile.conf.php does not exist (and as such its constants are not available)

main/auth/profile.php

@@ -251,7 +251,7 @@ $form->addRule('username', get_lang('UsernameWrong'), 'username');
 $form->addRule('username', get_lang('UserTaken'), 'username_available', $user_data['username']);
 
 //    OFFICIAL CODE
-if (CONFVAL_ASK_FOR_OFFICIAL_CODE) {
+if (defined('CONFVAL_ASK_FOR_OFFICIAL_CODE') && CONFVAL_ASK_FOR_OFFICIAL_CODE === true) {
     $form->addElement('text', 'official_code', get_lang('OfficialCode'), array('size' => 40));
     if (api_get_setting('profile', 'officialcode') !== 'true') {
         $form->freeze('official_code');
@@ -259,7 +259,9 @@ if (CONFVAL_ASK_FOR_OFFICIAL_CODE) {
     $form->applyFilter('official_code', 'stripslashes');
     $form->applyFilter('official_code', 'trim');
     $form->applyFilter('official_code', 'html_filter');
-    if (api_get_setting('registration', 'officialcode') == 'true' && api_get_setting('profile', 'officialcode') == 'true') {
+    if (api_get_setting('registration', 'officialcode') == 'true' && api_get_setting('profile',
+            'officialcode') == 'true'
+    ) {
         $form->addRule('official_code', get_lang('ThisFieldIsRequired'), 'required');
     }
 }
@@ -498,7 +500,7 @@ function is_platform_authentication() {
  * @return    boolean    Editability of the profile
  */
 function is_profile_editable() {
-    return $GLOBALS['profileIsEditable'];
+    return (empty($GLOBALS['profileIsEditable']) ? false : $GLOBALS['profileIsEditable']);
 }
 
 /*