[Python] add new field to yaml file using ruamel.yaml adds extras new line

Original file

controls:
- id: AC-1
levels:
- high
- moderate
- low

- id: AC-2


When i add a new field to mapping, it looks like this, rules is the new added field.It adds a new extra new line.

controls:
- id: AC-1
levels:
- high
- moderate
- low

rules: []
- id: AC-2


But i want this, is this possible.

controls:
- id: AC-1
levels:
- high
- moderate
- low
rules: []

- id: AC-2


I saw there is a similar question Modifying YAML using ruamel.yaml adds extra new lines, but i believe this is very old.

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