Allow to remove a website in the user profile

[christianlupus]

… entry completely

• Resolves: [Bug]: Contents of the "Website" field under "Personal settings" -> "Personlal info" cannot be deleted. #55003

Summary

The removal of a website in the profile is prevented as the empty string is no valid URL. This circumvents the check if the string is empty.

TODO

• ...

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone added for target branch/version (ex: 32.x for stable32)

[szaimen]

LGTM but didnt test

[christianlupus]

I tested on the current master (well yesterday) and it worked in the frontend to add and remove an URL.

[susnux]

/backport to stable32

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