Database Picker causes exception in Issue Search

Description

When using the Database Picker fields with certain context configured, it causes exceptions in the Issue Search page

Steps to Reproduce

1. Create a database picker field
2. Set the context of the field to only apply to one issue type (for example, Story)
3. Search for issues that would contain that issue type as well as at least on other issue type (for example, Story and Bug)
4. Try searching for issues, and include the database picker field as a column

Expected Result

The column will show the field values for applicable issues, and nothing in the rest

Actual Result

For issues that are not within the issue type context configured for the field, it returns an exception in the search :