Automated cherry pick of #906: always show search input

[erda-bot]

Cherry pick of #906 on release/1.2.

Squashed commit message:

commit 08ac80a7732a39f663abb47ef7c5e525f935572a
Author: Zero <mobius_pan@yeah.net>
Date:   Wed Aug 11 11:33:07 2021 +0800

    fix(dop): always show search input (#906)

---

What this PR does / why we need it:

always show search input

Does this PR introduce a user interface change?

❎ No

ChangeLog

Language	Changelog
🇺🇸 English	fix the bug that the search box does not display when the data is empty
🇨🇳 中文	修复空数据时搜索框不显示的bug

Does this PR need be patched to older version?

✅ Yes(version is required)

release/1.2

Which issue(s) this PR fixes:

Fixes #