Tong Li 77a0603beb db2 does not allow None as a key for user_id in user collection
mongodb allows None value as a key for _id field, but db2 does not.
this patch will fix the problem when meters coming with user_id
being set to None.

Change-Id: If48e5117198f3e9ad834e4f7fa58ec27c57a8bc8
fixes: bug #1234165
2013-10-02 09:19:18 -04:00
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