fix: 数量不能为空或者小于0

src/views/supply/engin/components/engin_form.vue

@@ -906,7 +906,7 @@ export default {
               return
             }
             console.log(this.goodsList[i].qty );
-            if (this.goodsList[i].qty == null || Number(this.goodsList[i].qty) < 0) {
+            if (this.goodsList[i].qty == null || this.goodsList[i].qty == '' || Number(this.goodsList[i].qty) < 0) {
               this.$errorMsg('数量不能为空或者小于0')
               return
             }