解决刚刚打开单据的新增界面，切换客户导致明细里面清空的bug

jshERP-web/src/views/bill/mixins/BillModalMixin.js

@@ -716,6 +716,7 @@ export const BillModalMixin = {
             barCodeStr += detail.barCode + ','
           }
         }
+        if(barCodeStr) {
           let param = {
             barCode: barCodeStr,
             organId: organId,
@@ -769,6 +770,7 @@ export const BillModalMixin = {
               });
             }
           })
+        }
       })
     },
     scanEnter() {