I'm submitting a ...

• bug report
• feature request
• other

Current behavior:

When using ngModelOptions on the same tag as the ngApp, the value of defaultModelOptions gets set to undefined. This causes errors for every ngModel directive in the template.
The error seems to come from NgModelOptionsController $onInit where the parentOptions is undefined and the createChild method can't be executed.

Expected / new behavior:

There should not be an error when a ngModelOption is defined on the same tag as an ngApp.
Or, it should be present in the migration documentation.

Minimal reproduction of the problem with instructions:

https://plnkr.co/edit/jOmVWDvIFuOyOWB2

AngularJS version: 1.6.10

Browser: Chrome 65, probably in all browsers

Anything else: