SW-9417 - modified if statement, check on mail content not on mail object
SW-9373 - deleted broken links and useless css
Merge pull request #1626 in SW/shopware from bugfix/master/sw-9373-missing-resources-in-the-default-template to master

* commit 'a5620171b5f6214a53fd0bca78fc15ca88810ffc':
  SW-9373 - deleted broken links and useless css
Merge pull request #1602 in SW/shopware from bugfix/master/sw-9417-fix-mail-pop-up-if-order-status-changed to master

* commit '2c6a7afbdd8394a588ab51ed7af79f6531ff6ee6':
  SW-9417 - modified if statement, check on mail content not on mail object