Description of the problem

If a user sets their Column grouping within the Entry Manager to a grouping that does NOT include a Column that can be sorted/ordered, a fatal PHP error is thrown and the Entry Manager becomes unusable for said member.

Further, a PHP notice gets thrown if the above since it's assumed the entry_id key would exist. I does not.

This happens across PHP and MySQL versions and has no bearing on output.

How To Reproduce
Steps to reproduce the behavior:

1. Within a Channel Entry List
2. Deselect all checked columns except Categories
3. Refresh the page
4. page borks

Error Messages

Call to a member function getEntryManagerColumnSortField() on null
Edit.php:167

Possible Solution
Checking for the existing and instanceof said variable

Additional context