Database A contains a Single-Reported Activity A.1
Activity A.1 contains a Multi-Select Attribute Field, with only one option
User tries to export Activity A.1 using the classic structure as the export method.
Export should succeed, containing all data in the Activity
Export starts, but then fails due to an unspecified error on server
When a Multiple Selection field with more than 0 options is exported, we create a "Merged Region" of multiple cells. However, on a HSSFSheet a "Merged Region" must contain 2 or more cells. Therefore, when a Multi-Select Attribute field with only 1 option is encountered, it attempts to create a merged region but fails as it must contain 2 or more cells.