CSV Export downloads an empty HTML file named 'undefined.html' when exporting 0 result

When clicking on icon Export CSV in a search page or a folderish document that contains 0 result, it downloads an empty HTML name undefined.html instead of a CSV file with the header line.

How to reproduce:

• navigate to an empty workspace
• click the Export CSV icon

Expected result: a CSV file is downloaded with simply the header line
Actual result: an empty HTML file is downloaded

It can be easily reproduced on nightly-2021.

See attached HAR files with Chrome and Firefox.