fix: RootDataEntity identifier is not allowed for other entities.

[Pfeil]

We handle it the same as "null". Which means an ID will not be set and instead one will be generated.

Closes #48

[coveralls]

Pull Request Test Coverage Report for Build #244

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.1%) to 90.618%

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Totals
Change from base Build #243:	0.1%
Covered Lines:	1584
Relevant Lines:	1748

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💛 - Coveralls