Adds "convert_to_variant" function for the StockItem model
Adds "convert_to_variant" function for the StockItem model

inventree/InvenTree,inventree/InvenTree,inventree/InvenTree,SchrodingersGat/InvenTree,SchrodingersGat/InvenTree,SchrodingersGat/InvenTree,SchrodingersGat/InvenTree,inventree/InvenTree