Update test to avoid false negative when include contains an empty line

[mgrsskls]

This case is incorrectly reported as an error:

{% include "template.twig" with {

} only %}

[d34dman]

Investigated this a little and found that our test is throwing false negative.

The test is catching a different violation called "0 space should be used for empty hashes" when we use above code.

array (
  0 => 
  FriendsOfTwig\Twigcs\Validator\Violation::__set_state(array(
     'line' => 31,
     'column' => 41,
     'reason' => '0 space should be used for empty hashes.',
     'filename' => 'src.html.twig',
     'severity' => 3,
     'source' => 'FriendsOfTwig\\Twigcs\\Rule\\RegEngineRule',
  )),
)