fix(pro:search): empty input segment should be invalid #1494
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PR Checklist
Please check if your PR fulfills the following requirements:
What is the current behavior?
input类型搜索项,先输入,再退格清除,此时空的输入会被校验为合法
What is the new behavior?
修复以上问题,空字符串一律返回 undefined
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