avoid blank hash in embeded parameter#321

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y00rb wants to merge 3 commits intoremi:masterfrom

SeniorAdvisor:master

Commits on Mar 9, 2015

avoid blank hash in embeded
y00rb
committed

Commits on Mar 10, 2015

to support has_one in embeded params
xueshibing
committed

Commits on Mar 11, 2015

add test for has_one
xueshibing
committed