Requesting cooking with email address + "Enter " key returns an error

1. Go to https://archive.softwareheritage.org/browse/origin/directory/?origin_url=https://github.com/chromium/chromium
2. Click "Download"
3. Type email address
4. Press Enter
5. Browser is redirected to https://archive.softwareheritage.org/browse/origin/directory/? which shows "BadInputExc: An origin URL must be provided as query parameter."

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Migrated from T3845 (view on Phabricator)