修复商品创建异常

api/product.py

@@ -197,7 +197,7 @@ class ProductUpdateView(APIView):
         effect_ids = json.loads(request.POST.get('effect_ids', '[]'))
         is_online = request.POST.get('is_online')
         brand_id = request.POST.get('brand_id')
-        period_of_use = request.POST.get('period_of_use', 0)
+        period_of_use = request.POST.get('period_of_use', 0) or 0
 
         if not id_:
             return r'缺少参数'