Problem/Motivation
Per #1898434-75: Remove theme_options_none, use an alter hook instead for changing empty option label, $field->id might turn into a protected property, so the API example should use $field->id() instead.
Proposed resolution
Patch hook_options_list_alter() in options.api.php to use $field->id() instead of $field->id.
Remaining tasks
Create patch.
User interface changes
n/a
API changes
n/a
Related Issues
#1898434: Remove theme_options_none, use an alter hook instead for changing empty option label