[Testing Board] After a "No results found" search, the page says "No Test Plans" when reopening Test Plans

Description
In the Testing Board, the page says No Test Plans when clicking/reopening Test Plans after a "No results found" search. 

Pre-conditions
-

How to reproduce

1. Open Testing Board
2. Click Test Plans
3. Enter search value which yields "No results found"
4. Click on hamburger button
5. Click Test Plans

Actual result/Attachments

Expected result
The page should remain the same, showing "No results found" with the Search field still filled.

Version

• 7.3.0

Workaround

• Refresh the page
• Go to Test Executions and back to Test Plans