Added handling in the preview of measurements to return 1 if the study is not saved yet

GCP-10605

Reviewer: Mae Turiana
Added 1 more test case to cover if the original workbook is null

GCP-10605

Reviewer: Mae Turiana
Added a logic to display the cell as accepted value if the display value is not part of the valid values

BMS-199

Reviewer: Mae Turiana