another "ScToken::GetDoubleRef: virtual dummy called"
another "ScToken::GetDoubleRef: virtual dummy called"

When checking for svSingleRef or svDoubleRef, also check for
svExternalSingleRef or svExternalDoubleRef. Otherwise the dummy reference is
treated.

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