fdo#62155 - don't crash if we can't create an instance of a calc addin.
fdo#62155 - don't crash if we can't create an instance of a calc addin.

Change-Id: I478d7777949683a91e7adf9fa6b54e9d01ced676

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