When adding a new field, you have an option to assign it to a group. If no groups have been created, the dropdown still exists but has no options.
A message should be displayed instead of a empty dropdown, saying something along the lines of:
Please create a group if you wish to assign the field to one
Empty dropdown
Joomla 3.7-aplha 1
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| Status | New | ⇒ | Closed | 
| Closed_Date | 0000-00-00 00:00:00 | ⇒ | 2016-12-22 23:57:38 | 
| Closed_By | ⇒ | zero-24 | 
In staging, it already looks different:

That should fix that issue as well, right?