It's not possible to use the Atum object when not loaded from file

[benedeki]

Describe the bug

When _INFO file is not loaded from a file, certain (many?) functions of the Atum object are not possible to use, because Accumulator is null.
There is no other public way how to initialize the Accumulator but loading an _INFO file

To Reproduce

Steps to reproduce the behavior OR commands run:

1. Include Atum in the project
2. Create a ControlMeasure via ControlMeasureBuilder (maybe this step is not even needed)
3. Call Atum.setAdditionalInfo(...)
4. Run the application/piece of code
5. See error

Expected behavior

Prevent the runtime error in some way.