Kenny Root 0150e48200 KeyChain: return null instead of throw
The API documentation says it will return null if the key isn't found.
We get null back from the keystore daemon when it can't retrieve the
data, so just return null back to the API caller.

Change-Id: I42248bd50cbc5f76864bd762aae3faab1c50529d
2013-02-13 15:24:06 -08:00
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