Avoid possible null reference exception when building index.
Avoid possible null reference exception when building index.

ronnymgm/csla-light,jonnybee/csla,ronnymgm/csla-light,rockfordlhotka/csla,BrettJaner/csla,rockfordlhotka/csla,JasonBock/csla,MarimerLLC/csla,JasonBock/csla,rockfordlhotka/csla,ronnymgm/csla-light,BrettJaner/csla,MarimerLLC/csla,JasonBock/csla,jonnybee/csla,BrettJaner/csla,MarimerLLC/csla,jonnybee/csla