feature/ISTWCMS-6454-ocardena:fix redirection sources

Summary of changes

  • Replace domine for slash and skip on empty value in source.

How to test?

  • Checkout this branch
  • Run drush mr uw_path_redirect && drush mim uw_path_redirect
  • Go to /admin/config/search/redirect and verify the redirection page its working and the redirections looks good.

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