The issue is not present in wmf.7 - the attempt to save a blank name will display a red outline indicating invalid input.
- On RC page with filters enabled and several filters selected, click on the bookmark icon and press the spacebar several times to enter white spaces as a filter name.
- 'Create filter' button is active and can be clicked to save the filter selection with a blank name.
- Rename any filter by entering white spaces as a name - the issue is present in production.
- The Saved filters will display blank names: