update 优化 校验租户判空逻辑

Signed-off-by: 秋辞未寒 <545073804@qq.com>

ruoyi-auth/src/main/java/org/dromara/auth/service/SysLoginService.java

@@ -243,12 +243,12 @@ public class SysLoginService {
         if (!TenantHelper.isEnable()) {
             return;
         }
-        if (TenantConstants.DEFAULT_TENANT_ID.equals(tenantId)) {
-            return;
-        }
         if (StringUtils.isBlank(tenantId)) {
             throw new TenantException("tenant.number.not.blank");
         }
+        if (TenantConstants.DEFAULT_TENANT_ID.equals(tenantId)) {
+            return;
+        }
         RemoteTenantVo tenant = remoteTenantService.queryByTenantId(tenantId);
         if (ObjectUtil.isNull(tenant)) {
             log.info("登录租户：{} 不存在.", tenantId);