jichenjc 9a36e7cda4 add description about key_name
add description about key_name, which tells user 'null' is not
accepted parameter.

this is ths solution that other than change the code.

Change-Id: Id84c7803fdd44961497cd35c15ece98e2852d4f6
Related-Bug: 1700825
2017-07-28 01:48:56 +08:00
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