[JUNGFRAU][CORRECT] Fix/store roi only if defined
Description
A bug was introduced here https://git.xfel.eu/detectors/pycalibration/-/merge_requests/762/diffs that lead to creating CONTROL and INSTRUMENT sections for ROI even if none was defined.
How Has This Been Tested?
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Types of changes
- Bug fix (non-breaking change which fixes an issue)
Checklist:
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Edited by Karim Ahmed