Fixes #393 - JsonToYaml error on json array

[btiteux]

fixes bug when trying to convert json with root array.

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• UI change (please include screenshot!)
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Internationalization and localization
• Other (please describe):

What is the current behavior?

The JsonToYaml tool show an error when the user type the following yaml:

- key: value
  key2: 1
- key: value2
  key2: 2

Issue Number: #393

Without issue created the same tool can't convert the following json:

[
  {
    "key": "value",
    "key2": 1
  },
  {
    "key": "value2",
    "key2": 2
  }
]

What is the new behavior?

The JsonToYaml tool doesn't show an error when the user type the following yaml:

- key: value
  key2: 1
- key: value2
  key2: 2

The JsonToYaml tool can convert the following json

[
  {
    "key": "value",
    "key2": 1
  },
  {
    "key": "value2",
    "key2": 2
  }
]

Other information

Quality check

Before creating this PR, have you:

• Followed the code style guideline as described in CONTRIBUTING.md
• Verified that the change work in Release build configuration
• Checked all unit tests pass

[veler]

Looks great! Worth adding a test for it? 🤔

[veler]

Hum, why not removing this?