[Test] Unit test for EmptyLineMissedSniff

[lenaorobei]

Description

EmptyLineMissedSniff needs to be covered with unit test.

Acceptance Criteria

1. Test is added to the Magento/Tests/Whitespace directory and extend AbstractSniffUnitTest.
2. Positive as well as negative scenarios are covered by unit test. In other words, EmptyLineMissedUnitTest.inc should contain "error" code as well as example of "good" code.

Additional information

See already implemented unit tests under Magento/Tests directory.
Check your code by running

$ bin/phpunit

[lenaorobei]

Hello @hitarthpattani! How is your progress with this ticket? Do you need any assistance?