[Bug Report] Undefined as class-name in expand column type
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- Dominant language
- Vue
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- 54k
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Description
### Element UI version
2.15.0
### OS/Browsers version
MacOS / Chrome latest version
### Vue version
2.6.12
### Reproduction Link
https://codepen.io/pen/?&prefill_data_id=b8883d16-9d2d-441d-9e6e-055a46169d28
### Steps to reproduce
Open devtolls. Navigate to expandable column cell.
### What is Expected?
No undefined class in column classes
### What is actually happening?
classes: el-table_{number}_column_{number} undefined el-table__expand-column el-table__cell.
This behavior caused by https://github.com/ElemeFE/element/blob/55bac06f0f9e26b820518243f3987cab9699001b/packages/table/src/table-body.js#L210 where is column.className is undefined
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