Select: Add slot empty (#13769)

[elfman]

close #13769

[element-bot]

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[robin-dongbin]

emptyText() {
        if (this.loading) {
          return this.loadingText || this.t('el.select.loading');
        } else {
          if (this.remote && this.query === '' && this.options.length === 0) return false;
          if (this.filterable && this.query && this.options.length > 0 && this.filteredOptionsCount === 0) {
            return this.noMatchText || this.t('el.select.noMatch');
          }
          if (this.options.length === 0) {
            return this.noDataText || this.t('el.select.noData');
          }
        }
        return null;
      },

提交时有审核这段代码么？很明显的错误

[elfman]

@winter-ice 这个pr并没有修改到emptyText的逻辑，只是让需要使用emptyText的时候改为使用slot。
你觉得emptyText的实现有啥问题？

[robin-dongbin]

见我提的issue #14888