defaults json in oqs for create

app/controllers/settings/order_queue_stations_controller.rb

@@ -27,6 +27,7 @@ class Settings::OrderQueueStationsController < ApplicationController
   def create
     @settings_order_queue_station = OrderQueueStation.new(settings_order_queue_station_params)
     @settings_order_queue_station.created_by = current_login_employee.name
+    @settings_order_queue_station.processing_items = "[]"
     respond_to do |format|
       if @settings_order_queue_station.save
         format.html { redirect_to settings_order_queue_stations_path, notice: 'Order queue station was successfully created.' }