Add Contract 的页面的必填校验

packages/cpt_sg/lib/modules/agency/contract_add/contract_add_controller.dart

@@ -59,6 +59,22 @@ class ContractAddController extends GetxController with DioCancelableMixin {
 
   /// 提交
   void doSubmit() async {
+
+    if (state.selectedAgencyId == null) {
+      ToastEngine.show("Please Select Agency".tr);
+      return;
+    }
+
+    if (state.selectedStartTime == null) {
+      ToastEngine.show("Please Select Start Time".tr);
+      return;
+    }
+
+    if (state.selectedEndTime == null) {
+      ToastEngine.show("Please Select End Time".tr);
+      return;
+    }
+
     Future<HttpResult> taskFuture;
     if (state.type == 0) {
       taskFuture = _agencyRepository.addContractSubmit(