AdjunctManager is installed only during the Hudson class constructor, so if the bootup fails in the pre-test of WebAppMain, it never gets instantiated, which breaks the <layout> tag, yet it's used to render error messages.

I can add AdjunctManager to ErrorObject, but for the time being it was easier to make this a non-fatal error by changing stapler.

I believe this is a regression introduced in ffbc0829bcb0c9e0abebca6c92663374abda0511