BaseTools: enhance error handling for DSC file

Add logic for DSC file validation for Prebuild init. Add logic to detect
error for DSC parser when '{' is missing.

Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Yonghong Zhu <yonghong.zhu@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

BaseTools/Source/Python/build/build.py

@@ -920,6 +920,9 @@ class Build():
 
     def InitPreBuild(self):
         self.LoadConfiguration()
+        ErrorCode, ErrorInfo = self.PlatformFile.Validate(".dsc", False)
+        if ErrorCode != 0:
+            EdkLogger.error("build", ErrorCode, ExtraData=ErrorInfo)
         if self.BuildTargetList:
             GlobalData.gGlobalDefines['TARGET'] = self.BuildTargetList[0]
         if self.ArchList: