fix: 用户不存在可用角色，服务端异常的问题修复

@@ -600,6 +600,9 @@ public class SysUserServiceImpl extends AbstractBaseService<UserMapper, SysUserE
               .stream()
               .map(SysUserRoleEntity::getRoleId)
               .collect(Collectors.toList());
+      if(roleIds.isEmpty()){
+        roleIds.add(UUID.randomUUID().toString());
+      }
       List<String> enableRoles =
           roleMapper
               .selectList(