Feature: remove empty lines if desired

[ciklista]

Issue
The way ruamel is currently used will keep empty lines in property files, e.g.

- name: customer_id
    description: ''

- name: created_at
  description: ''

Features
It would be great if we could set a flag that would remove these.

Pot. solution
This thread could be a starting point: https://stackoverflow.com/questions/42708668/removing-all-blank-lines-but-not-comments-in-ruamel-yaml