fix removing duplicated rows when outer_joins is used in nested scaffolds on rails4
fix removing duplicated rows when outer_joins is used in nested scaffolds on rails4

activescaffold/active_scaffold,AlbertoBarrago/active_scaffold,activescaffold/active_scaffold,mallikarjunayaddala/active_scaffold,AlbertoBarrago/active_scaffold,mallikarjunayaddala/active_scaffold,AlbertoBarrago/active_scaffold,mallikarjunayaddala/active_scaffold,budree/active_scaffold,activescaffold/active_scaffold,budree/active_scaffold,budree/active_scaffold