Unable to select requester without barcode

Steps to repro:

1. Noticed this in BugFest but it repros in snapshot
2. Create a user with no barcode
3. Go to Inventory, pick an item and create a request
4. In the request creation form, use the Requester lookup to find the user you created
5. Select user

Expected: Should be possible to select a requester with no barcode

Actual: Selection silently fails

Additional info:

• It is currently not possible to check an item out to someone who has no barcode, but that is not desired behavior and we will fix it as part of UICHKOUT-511
• There is no reason why a requester without a barcode shouldn't be able to have a request