createelement() has been called outside of render function

### Existing Component
是

### Component Name
el-table

### Description
vue2.6 是正常的， 升级到2.7后 就报标题的错误了

const columns = [
{
label: '客服名称',
prop: 'name',
},
{
label: '联系方式',
render: (h: any, scope: { row: OrgCustomerService}) => {
return h('span', null, scope.row.contactType === ContractType.Phone ? '电话客服' : '微信客服')
}
},
]