#332145 by catch and Arancaytar: Fix regression on term submit form.

modules/taxonomy/taxonomy.admin.inc

@@ -766,7 +766,7 @@ function taxonomy_form_term_submit($form, &$form_state) {
     $current_parent_count = count($form_state['values']['parent']);
     $previous_parent_count = count($form['#term']['parent']);
     // Root doesn't count if it's the only parent.
-    if ($current_parent_count == 1 && isset($form_state['values']['parent'][''])) {
+    if ($current_parent_count == 1 && isset($form_state['values']['parent'][0])) {
       $current_parent_count = 0;
       $form_state['values']['parent'] = array();
     }

modules/taxonomy/taxonomy.module

@@ -1089,7 +1089,7 @@ function _taxonomy_term_select($title, $name, $value, $vocabulary_id, $descripti
   $options = array();
 
   if ($blank) {
-    $options[''] = $blank;
+    $options[0] = $blank;
   }
   if ($tree) {
     foreach ($tree as $term) {

modules/taxonomy/taxonomy.test

@@ -595,6 +595,9 @@ class TermEditTestCase extends DrupalWebTestCase {
       'name' => $this->randomName(12),
       'description' => $this->randomName(100),
     );
+    // Explictly set the parents field to 'root', to ensure that
+    // taxonomy_form_term_submit() handles the invalid term ID correctly.
+    $edit['parent[]'] = 0;
 
     // Create the term to edit (adding to the default 'Tags' vocabulary).
     $this->drupalPost('admin/content/taxonomy/1/add/', $edit, t('Save'));