Empty class ( no attributes ) can't be instantiated

This is my setup

• Fresh install of xwiki 10.7 ( the bug is also present in 10.6.1 and probably before) with standard XWiki flavor
• hsqldb
•  tomcat 9.0.12
• Nothing changed in the config, just put thw war in tomcat and run

We found a bug when you create an empty class with no property it doesn't appear in the list off class or in XWikiClass

How to reproduce :

• Create a new App Within Minute "Foo" and press next step every time then finish ( do nothing )
• Then create a new Foo page named "bar"
•  Go in the object editor of "Bar"
•  Here you will found 2 bug, first you can't see the class Foo in the `Select a class` list, second bug if you press "new Code.FooClass object" you got a "Failed:Server not responding"
• You can also see that if you go in XWikiClass from page index and look for "Foo" you will found nothing
• Now go to the class editor and edit the Foo class by adding any properties.
• Now everything works, you can see the class in the list and you can instantiate a `New Code.FooClass object` and also you can see Bar in the XWikiClass if you look for "Foo"