[User Creatable Servers] Can't set empty node tags

[DasEric]

I installed the plugin and configured everything as required.

However, I noticed an issue with the default node tag in the admin settings. I am unable to remove the default node tag because there is no separate save button.

When I remove the tag and click Submit, it appears to be removed at first, but when I open the settings again, the default tag is there again.

As a workaround, I assigned the default tag to my node. However, users are still unable to create their own servers.
Whenever a user tries to create a server, the following error appears:

Could not create server

No available node was found. Please contact a panel administrator.

Expected Behavior

• The default node tag should be removable and the change should be saved.
• If a node has the configured default tag, users should be able to create servers on that node.

Actual Behavior

• The default node tag cannot be permanently removed.
• Even when the node has the default tag assigned, users receive the "No available node was found" error when trying to create a server.