debugger: fix error summary for not-found-in-roots.
debugger: fix error summary for not-found-in-roots.

factor/factor,bpollack/factor,factor/factor,mrjbq7/factor,mrjbq7/factor,bjourne/factor,AlexIljin/factor,slavapestov/factor,tgunr/factor,sarvex/factor-lang,mrjbq7/factor,factor/factor,sarvex/factor-lang,tgunr/factor,bpollack/factor,bjourne/factor,sarvex/factor-lang,AlexIljin/factor,sarvex/factor-lang,bjourne/factor,slavapestov/factor,slavapestov/factor,dch/factor,nicolas-p/factor,bjourne/factor,bjourne/factor,factor/factor,AlexIljin/factor,nicolas-p/factor,dch/factor,sarvex/factor-lang,nicolas-p/factor,sarvex/factor-lang,nicolas-p/factor,tgunr/factor,slavapestov/factor,bpollack/factor,factor/factor,mrjbq7/factor,tgunr/factor,slavapestov/factor,sarvex/factor-lang,slavapestov/factor,bpollack/factor,AlexIljin/factor,dch/factor,mrjbq7/factor,AlexIljin/factor,bpollack/factor,dch/factor,tgunr/factor,slavapestov/factor,bpollack/factor,nicolas-p/factor,mrjbq7/factor,tgunr/factor,dch/factor,AlexIljin/factor,bjourne/factor,bjourne/factor,nicolas-p/factor,factor/factor,dch/factor,nicolas-p/factor,bpollack/factor,AlexIljin/factor