os-prober warning considered error?

Hi.

I just noticed that FAI installs were waiting at the end because of a 
single line in error.log:
shell.log:Warning: os-prober will not be executed to detect other 
bootable partitions.

I've added it to globalignorepatterns in hooks/savelog.LAST.sh (from 
'Warning' to the end).

Now I get "Congratulations! No errors found in log files" but 
task_faiend still prompts for Enter key to reboot.
What did I miss? Specifying "reboot" flag seems wrong, since it forces 
reboot even in case of errors, IIUC.

-- 
Diego Zuccato
DIFA - Dip. di Fisica e Astronomia
Servizi Informatici
Alma Mater Studiorum - Università di Bologna
V.le Berti-Pichat 6/2 - 40127 Bologna - Italy
tel.: +39 051 20 95786