Don't reorder empty lines

[hron84]

Given the following test file:

test: passed

anotherTest: failed

The expected output should contain the empty line between the two keys. Bu the actual output is:

test: passed
anotherTest: failed

Which is not what I expect. Either remove empty lines or keep them where they should be.

If there are more empty lines, they all moved to the beginning of the output.

YH version: 0.4.0