Issue #1048642 by greg.harvey: Check for remove_flags in Feeds UI before using that variable.

feeds_ui/feeds_ui.admin.inc

@@ -608,11 +608,13 @@ function feeds_ui_mapping_form_submit($form, &$form_state) {
     }
   }
 
-  foreach ($form_state['values']['remove_flags'] as $k => $v) {
-    if ($v) {
-      unset($mappings[$k]);
-      // Keep our keys clean.
-      $mappings = array_values($mappings);
+  if (!empty($form_state['values']['remove_flags'])) {
+    foreach ($form_state['values']['remove_flags'] as $k => $v) {
+      if ($v) {
+        unset($mappings[$k]);
+        // Keep our keys clean.
+        $mappings = array_values($mappings);
+      }
     }
   }
   $processor->addConfig(array('mappings' => $mappings));