This are harmless notices, just set your error reporting level in Joomla to lower value (minimal or none), newer php version have higher default error reporting levels so you need to lower it down in Joomla.
That is what I did. I did set the PHP Version on Provider Side back to PHP 5.4 and the harmless notices were not anymore displayed on the content view. But it will be a limited time we should use PHP 5.4 and it is recommended to skip to PHP 5.6.