BaseTools/ECC: Ignore duplicate check for 'NULL' library
BaseTools/ECC: Ignore duplicate check for 'NULL' library

Update a checkpoint to ignore duplicate check for 'NULL' library

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hess Chen <hesheng.chen@intel.com>
Reviewed-by: Yingke Liu <yingke.d.liu@Intel.com>

git-svn-id: 3158a46dfd52e07d1fda3e32e1ab2e353a00b20f@16154 6f19259b-4bc3-4df7-8a09-765794883524

MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2