Set the FdfPcdSet to be empty if the platform DSC does not has assosicated FDF file.
Set the FdfPcdSet to be empty if the platform DSC does not has assosicated FDF file.

git-svn-id: f3880c1fc5096ce2109c8aec392d8e07f619f417@1829 c2973edb-eda0-4c78-bc6a-9341b269661f

bitcrystal/buildtools-BaseTools,bitcrystal/buildtools-BaseTools,bitcrystal/buildtools-BaseTools,tianocore/buildtools-BaseTools,tianocore/buildtools-BaseTools,tianocore/buildtools-BaseTools,bitcrystal/buildtools-BaseTools,tianocore/buildtools-BaseTools,tianocore/buildtools-BaseTools,bitcrystal/buildtools-BaseTools