Invalid value initialization in extract_embedded_relationships

[JeremyCloarec]

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Description

{ Please provide a clear and concise description of the bug. } When extracting ref relationships in extract_embedded_relationships, we initialize multiple values with an empty array (like object_label_ids for example). This needs to be double checked, but this looks like a bug: these values should be initialized to a None value instead of an empty array [] if they are not in the bundle

Environment

1. OS (where OpenCTI server runs): { e.g. Mac OS 10, Windows 10, Ubuntu 16.4, etc. }
2. OpenCTI version: { e.g. OpenCTI 1.0.2 }
3. Other environment details:

Reproducible Steps

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2. { e.g. Click ... }
3. { e.g. Error ... }

Expected Output

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Actual Output

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Additional information

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