Steps to reproduce the issue

Run php development server at command line
Install Joomla 3.7.0 Alpha 1
Login to Admin
Content -> Fields -> New
Enter test for title and label
click save

(Note that we did not create a field group, we did not select a field group)

Expected result

No warnings or notices

Actual result

Undefined property before 303 redirect on save.

[Thu Dec 22 16:51:44 2016] PHP Notice:  Undefined property: FieldsTableField::$assigned_cat_ids in /Users/phil/Sites/Joomla_3.7.0/administrator/components/com_fields/tables/field.php on line 113
[Thu Dec 22 16:51:44 2016] 127.0.0.1:55280 [303]: /administrator/index.php?option=com_fields&context=com_content.article&layout=edit&id=0

System information (as much as possible)

https://gist.github.com/c9327e4186cc2940ab5adc40a9c4a53a