Boolean field with 'Use field label instead of the "On value" as label' option shows no label in views filter options

Problem/Motivation

1. Create a FieldAPI field on an entity, and select the option "Use field label instead of the "On value" as label"
2. Create a view of this entity type
3. Add the boolean field as a filter
4. Problem: in the options popup for the filter handler, the 'Options' select box shows:

- SelectAll
- [BLANK]
- [BLANK]

Short of guessing at of the blank options and then seeing what effect it has on the query, it's impossible to use this.

Proposed resolution

Fix it.

Remaining tasks

User interface changes

The boolean field will work again with views.

API changes

Beta phase evaluation

Data model changes