fix:发票管理合同校验

src/main/java/cn/ezhizao/project/business/invoice/controller/BizInvoiceController.java

@@ -140,7 +140,7 @@ public class BizInvoiceController extends BaseController {
     @PostMapping
     @Transactional(rollbackFor = Exception.class)
     public AjaxResult add(@RequestBody BizInvoice bizInvoice) throws NoSuchFieldException, IllegalAccessException {
-        if(null != bizInvoice.getContractId()){
+        if(null == bizInvoice.getContractId()){
             return error("请选择合同");
         }
         BizCopyInfo info1 = new BizCopyInfo();
@@ -183,7 +183,7 @@ public class BizInvoiceController extends BaseController {
     @Transactional(rollbackFor = Exception.class)
     public AjaxResult edit(@RequestBody BizInvoice bizInvoice) throws NoSuchFieldException, IllegalAccessException {
         Long tenantId = getTenantId();
-        if(null != bizInvoice.getContractId()){
+        if(null == bizInvoice.getContractId()){
             return error("请选择合同");
         }
         BizCopyInfo info1 = new BizCopyInfo();