What steps will reproduce the problem?
1. Make an AdGroupAd Mutate ADD call with ExemptionRequests.

What is the expected output? What do you see instead?

Expect AdGroup Ad to be created with the exemption request.  Instead, we
get a KeyError exeption.

What version of the product are you using? On what operating system?

Version 7.2 with Windows Server 2003.

Please provide any additional information below.

The bug is located in aw_api/zsi_toolkit/SanityCheck.py.  If you look at
the ValidateExemptionRequest method, you'll notice that the code loops
through the key in the exemption then loops through the sub keys in each
key.  It then validates the exemption[subkey] instead of
exemption[key][subkey].