Undefined environment variables are now removed during script execution.
Excepted environment variables are now correctly un-excepted right before processing continues
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jaben Carsey <Jaben.carsey@intel.com>
reviewed-by: Matthews, Robert <Robert.Matthews@hp.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14585 6f19259b-4bc3-4df7-8a09-765794883524