[Bug Report] Select use option-group and filterable，search results still have a split line when there is only one group
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- Dominant language
- Vue
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Description
### Element UI version
2.13.2
### OS/Browsers version
win10
### Vue version
2.6.11
### Reproduction Link
https://codepen.io/duanmw/pen/RwrKZOV
### Steps to reproduce
Type "北京" into the search box
### What is Expected?
The search results are for "北京", and there is only one set of data at this time. There should be no dividing line
### What is actually happening?
A dividing line appears at the bottom
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