The error screens shown for invalid configurations after pressing 'Apply' don't work.
Steps to reproduce:
0. Install Jenkins Enterprise with Cloudbees Template Plugin 4.1
1. Create a job template
3. Clear the 'name' attribute's ID field
4. Press 'Apply'
Expected result: Error message shown
Actual result: Huge, empty dialog with title 'Error' shown (error screen seems to appear, but is immediately removed)