Do not fail for unset OSL_DEBUG_LEVEL (as happens in SDK)
Do not fail for unset OSL_DEBUG_LEVEL (as happens in SDK)

Change-Id: I0e9b8a251ed790d1505566ef4fa991309986522d

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