BaseTools: Report error for incorrect hex value format

The case is user use 0x1} as a hex value for Pcd, it directly cause
tool report traceback info. This patch add more error info.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Zhiju.Fan <zhijux.fan@intel.com>
Reviewed-by: Yonghong Zhu <yonghong.zhu@intel.com>
diff --git a/BaseTools/Source/Python/Common/Misc.py b/BaseTools/Source/Python/Common/Misc.py
index 2cf9574..430bf6b 100644
--- a/BaseTools/Source/Python/Common/Misc.py
+++ b/BaseTools/Source/Python/Common/Misc.py
@@ -1414,7 +1414,10 @@
         Value = Value.strip().strip('"')

         return ParseDevPathValue(Value)

     if Value.lower().startswith('0x'):

-        Value = int(Value, 16)

+        try:

+            Value = int(Value, 16)

+        except:

+            raise BadExpression("invalid hex value: %s" % Value)

         if Value == 0:

             return 0, 1

         return Value, (Value.bit_length() + 7) / 8