Enable the 'Import' button only when linked data exists.
Enable the 'Import' button only when linked data exists.

It makes no sense to allow import if there is no link specified.

Change-Id: I3ff4bfa7fd78c79a2c4ee74c7a1a34d2b7a2d1c4

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core