ting.wang e2158b7ef4 Clean redundant argument to dict.get
`dict.get()` returns `None` by default, if a key wasn't found.
Removing `None` as second argument to avoid redundancy.

Change-Id: Ia82f7469cd019509bbeccbfe54b15eeedc7bb6ea
2016-02-21 13:21:31 +08:00
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