When you add a URL on the "Helpful link" tile with a space at the beginning or at the end, there is an error message (incorrect URL) when you try to save modification. I Think a trim could solve the problem.
Hi Pierre - I'm able to reproduce the issue with the extra spaces causing the page from being published. A bug has been filed with our engineering team, under ID JIVE-62908, to change this behavior. If you would like to be notified of when this bug is resolved I'd encourage you to create a new private support case in your secret support group for this bug ID. We can then associate the bug with your case and notify you as soon as it is resolved.