Fix response when requesting nonexistent user

app/controllers/api/v1/users_controller.rb

@@ -40,7 +40,9 @@ module Api
       end
 
       def show
-        render_not_found_response('user') unless @user
+        if @user.nil?
+          render_not_found_response('user')
+        else
 
           conditions = build_conditions(request.params)
           conditions[:user_id] = @user.id
@@ -65,6 +67,7 @@ module Api
                                               per_page: COLLECTION_PER_PAGE
                                             })
         end
+      end
 
       def check_email
         render json: EmptyBlueprint.render_as_json(nil, email: params[:email], availability: true)