Problem was introduced in Radiator View plugin version 1.14. Version 1.13 works fine.

I use option "Show as Projects?". Radiator view is drawn correctly until an exception is thrown for a group of projects where at least one project does not have any builds.

Steps to reproduce:

1. Create a radiator view and configure project grouping by selecting "Show as Projects?" and include all projects.
2. Create a project with unique prefix "foo-x" (foo is the prefix here).
3. Browse to radiator view.
4. Attached dump should be written to jenkins log.