This change prevents an error caused by trying to export mapping results for a ProbeSet trait when there is no gene symbol
This change prevents an error caused by trying to export mapping results for a ProbeSet trait when there is no gene symbol

pjotrp/genenetwork2,genenetwork/genenetwork2,pjotrp/genenetwork2,genenetwork/genenetwork2,pjotrp/genenetwork2,genenetwork/genenetwork2,genenetwork/genenetwork2,pjotrp/genenetwork2,pjotrp/genenetwork2