Fixes following error which is sometimes returned in rails 5:
NoMethodError: undefined method `inject' for #<ActionController::Parameters:0x007f89a2faac70>
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1. File "/socialtravel/releases/20160123175638/vendor/bundle/ruby/2.3.0/gems/active_admin-sortable_tree-0.2.1/lib/active_admin/sortable_tree/controller_actions.rb" line 27 in block in sortable
2. File "/socialtravel/releases/20160123175638/vendor/bundle/ruby/2.3.0/gems/actionpack-5.0.0.beta1/lib/action_controller/metal/basic_implicit_render.rb" line 4 in send_action
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Fixes following error which is sometimes returned in rails 5: