BaseTools:Fix the issue that build report failed

BaseTools:Fix the issue that build report failed

BZ:https://bugzilla.tianocore.org/show_bug.cgi?id=2201

An error occurs using special VpdPcd that is not used in the Inf file

In dsc:
[PcdsDynamicExVpd.common.DEFAULT]
gBoardModuleTokenSpaceGuid.test1|*|{CODE({
  {0x0}  // terminator
})}

In dec:
[PcdsDynamicEx]
# Vpd GPIO table
  gBoardModuleTokenSpaceGuid.test1|{0}|GPIO_INIT_CONFIG[]|0x50000018 {
  <HeaderFiles>
    Library/GpioLib.h
  <Packages>
    MdePkg/MdePkg.dec
}
ValueError: invalid literal for int() with base 0: '*'

This Patch is going to fix issue

Cc: Liming Gao <liming.gao@intel.com>
Cc: Bob Feng <bob.c.feng@intel.com>
Signed-off-by: Zhiju.Fan <zhijux.fan@intel.com>
Reviewed-by: Bob Feng <bob.c.feng@intel.com>