Fix for WSOD error from menu_execute_active_handler() - on homepage (using Panels

  1. menu_execute_active_handler(): returned NULL - it's very bad!
  2. WSOD detected! Checking for problems...
  3. ERROR: menu_execute_active_handler() returned empty value!
  4. Validating theme hooks...
  5. Validation theme hooks completed.
  6. Done.
  7. Included render file: page.inc
  8. Checking page_manager_page_execute() page callback...
  9. ERROR: Callback: page_manager_page_execute() returned empty content!
  10. NOTICE: router_item = Array ( [path] => front_page-en [load_functions] => [to_arg_functions] => [access_callback] => ctools_access_menu [access_arguments] => a:1:{i:0;a:2:{s:4:"type";s:4:"none";s:8:"settings";N;}} [page_callback] => page_manager_page_execute [page_arguments] => Array ( [0] => um_frontpage_city ) [fit] => 1 [number_parts] => 1 [tab_parent] => [tab_root] => front_page-en [title] => [title_callback] => t [title_arguments] => [type] => 4 [block_callback] => [description] => [position] => [weight] => 0 [file] => sites/all/modules/ctools/page_manager/plugins/tasks/page.inc [href] => front_page-en [options] => Array ( ) [access] => 1 [localized_options] => Array ( ) [map] => Array ( [0] => front_page-en ) ) !
  11. Cleared cache via cache_clear_all()
  12. Cleared cache via drupal_flush_all_caches()
  13. Rebuilded module cache.

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