[Reportbug-maint] Bug#504424: Bug#504424: crashes when trying to report bugs of reportbug

[Ryo IGARASHI]

retitle 504424 reportbug sometimes crash when trying to display bugs
thanks

Hi,

I reproduce this bug again when trying to report a bug to zsh package.
Seeming that this issue is global, I change the title.

-- 
Ryo IGARASHI
rigarash at gmail.com