Content "Default URL alias pattern" setting will not remain empty (set to "none")

[jenlampton]

Description of the bug

I would like my pageless nodes to only be "visible" at their system paths node/123.

After moving the path settings to the node/type form, a default value is populated when the current value is empty, causing my empty settings to be overwritten with every save to this node type, unless I remmber to open up "URL Path Pattern" and delete the text from Default URL alias pattern

Steps To Reproduce

To reproduce the behavior:

1. Go to admin/structure/types/manage/page
2. Click on the vertical tab "URL Path Pattern"
3. Delete the default value
4. Scroll down and hit save
5. Go back to admin/structure/types/manage/page
6. Confirm the thing you just deleted is now back

Actual behavior

Default path patterns won't stay deleted.

Expected behavior

Default path patterns should stay deleted.

Recommended solution

I think we should add an additonal setting, Enable autmoatc URL aliases that sits at the top of this page. (and it should be checked by default)

• When checked the default path pattern will be automatically added into the field
• When UNchecked, it should not

This would match Moderation, Revisions, and Menu, other things in the vertical tabs.

Additional information

Add any other information that could help, such as:

• Backdrop CMS version:
• Web server and its version:
• PHP version:
• Database sever (MySQL or MariaDB?) and its version:
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[olafgrabienski]

@jenlampton When I save an empty URL alias pattern in the content type settings, I see the following message:

The Default URL alias pattern field was left empty, so the generic pattern of [node:content-type]/[node:title] will still be used. This can be changed on the URL alias patterns page.

There might be room for improvement, but with the message the current behavior isn't really unexpected, in my opinion. Don't you see the message on your site?