[Bug Report] el-tabs components default-value will be modified to '0'
- Dominant language
- Vue
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- 54k
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Description
### Element UI version
2.15.5
### OS/Browsers version
win10/chrome95
### Vue version
2.6.11
### Reproduction Link
https://codepen.io/blzbanme/pen/JjyZqPR?editors=1111
### Steps to reproduce
enter "https://codepen.io/blzbanme/pen/JjyZqPR?editors=1111"
click "send" within 10 seconds
### What is Expected?
The window will call "this.$message("there is no open window, don't send to server")"，
The pop-up window on the webpage shows "there is no open window, don't send to server"
### What is actually happening?
Because the default value has been modified to "0", the program behavior is wrong.
I found the code that caused the error，this code is located“element-ui\packages\tabs\src\tabs.vue”，line 176-178.
For what considerations, when el-tab-pane is empty, the default value of el-tabs will be initialized to 0. Should this be stated in the document?
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