Filter blocked users

Problem/Motivation

While testing this module I found that it doesn't filter out blocked users. For our purposes this is necessary as we need to ensure content can only be assigned to active users.

Steps to reproduce

1. Install the module
2. Create a user and set the account status to Blocked
3. Edit any moderated content that has the Reviewer field
4. Type the blocked user's name. It should appear in the results list.

Proposed resolution

I'll attach a patch that does the following:

• Adds a new "Workbench Reviewers" view of active users sorted by name
• Changes the Reviewer field's default handler to views and attaches it to the "Workbench Reviewers" view

I feel that this solution gives administrators the option to further refine the results list to their needs.

Remaining tasks

Testing and verification.

User interface changes

None.