fix(lastleg): return empty container customer options

lastleg-service/src/main/java/com/baiyue/lastleg/financefee/service/OverseasFeeBusinessGuard.java

@@ -29,7 +29,6 @@ public class OverseasFeeBusinessGuard {
             (result, rowNum) -> new ContainerCustomerOption(
                 result.getString("customer_id"), result.getString("customer_name")),
             String.valueOf(containerBookingId));
-        if (customers.isEmpty()) throw bad("真实货柜不存在或尚无尾程订单");
         return customers;
     }
 

lastleg-service/src/main/resources/openapi/overseas-finance-fees-v1.yaml

@@ -21,13 +21,13 @@ paths:
   /api/platform/v1/last-leg/finance-fee-sources/container-customers:
     get:
       summary: 查询真实来源柜内客户选项
-      description: 单次按真实来源柜聚合全部客户，供柜详情维护费用时选择，不逐票查询。
+      description: 单次按真实来源柜聚合全部客户，供柜详情维护费用时选择，不逐票查询；货柜不存在或尚无尾程订单时返回空列表。
       security: [{ bearerAuth: [] }]
       parameters:
         - { in: query, name: containerBookingId, required: true, schema: { type: string, pattern: '^[1-9][0-9]*$' } }
       responses:
         '200':
-          description: 柜内客户选项
+          description: 柜内客户选项；无数据时data为空数组
           content:
             application/json:
               schema: { $ref: '#/components/schemas/ContainerCustomerListResponse' }

lastleg-service/src/test/java/com/baiyue/lastleg/financefee/service/OverseasFeeBusinessGuardTest.java

@@ -80,6 +80,16 @@ class OverseasFeeBusinessGuardTest {
         assertThat(jdbc.sql()).singleElement().asString().contains("GROUP BY customer_id");
     }
 
+    @Test
+    void returnsEmptyWhenContainerHasNoLastlegOrders() {
+        StubJdbc jdbc = new StubJdbc();
+
+        var result = new OverseasFeeBusinessGuard(jdbc).listContainerCustomers(701L);
+
+        assertThat(result).isEmpty();
+        assertThat(jdbc.sql()).singleElement().asString().contains("source_container_booking_id");
+    }
+
     static SaveRequest containerFee(String customerId, Long bookingId, String containerNo) {
         return new SaveRequest(customerId, "客户A", "OVERSEAS_CONTAINER_FEE", "OVERSEAS_CONTAINER",
             bookingId, containerNo, null, null, null, null, bookingId, containerNo, 91L,