Handle instances of DatX models beeing passed to "getRawData" function.

[JosipJanus]

Relevant version

• 0.x
• 1.x
• 2.x

Relevant libraries

• utils
• core
• network
• jsonapi
• jsonapi-angular

Breaking change

No

Description

Currently the support for this doesn't exists which results in infinite loop.
In this case exception should be thrown.