when build a single module with GenC/GenMake option, currently it will direct return after create Autogen code files, then it cause MaList is empty, which cause an incorrect error message is reported. Cc: Liming Gao <liming.gao@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Yonghong Zhu <yonghong.zhu@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com>