[4.2] Do not checkout a record when the user is not logged in

[laoneo]

Summary of Changes

When not logged in users can create articles, an exception is thrown that the article can not be checked out when saving it.

Testing Instructions

• Set the create permission for the public user group to allowed.
• Create a "Create Article" menu item
• Open the front end as not logged in user
• Go to the "Create Article" menu item
• Set a title in the form
• Click on the "Save" button (NOT "Save and Close")

Actual result BEFORE applying this Pull Request

"Argument 'userId' of event onTableBeforeCheckout must be an integer " error is displayed.

Expected result AFTER applying this Pull Request

FrontPage is loaded with text "Article submitted.".