SUPEE-7405 on Magento 1.7.0.0

[rob3000]

When installing the SUPEE-7405 on magento 1.7.0.0 the patch is trying to remove the comment on these lines:

-/* @var $_helper Mage_Authorizenet_Helper_Data  */
-$_helper = $this->helper('authorizenet');
+/* @var $_helper Mage_Authorizenet_Helper_Admin  */
+$_helper = $this->helper('authorizenet/admin');

However the comment 

@var $_helper Mage_Authorizenet_Helper_Data

was not added until magento 1.7.0.1 and not in 1.7.0.0

I have got around the issue by added the comment to the file and then running the patch.

[sherrie]

Hi @rob3000, were you able to get this working?

[rob3000]

I needed to add 

/* @var $_helper Mage_Authorizenet_Helper_Data  */

above the helper declaration comment to the file and then ran the patch again and it worked.