Fixed: g-i-installation_debian_jessie_gnome_brltty/7

[jenkins]

See 
https://jenkins.debian.net/job/g-i-installation_debian_jessie_gnome_brltty/7/ 
and 
https://jenkins.debian.net/job/g-i-installation_debian_jessie_gnome_brltty/7//console
 and 
https://jenkins.debian.net/job/g-i-installation_debian_jessie_gnome_brltty/7//artifact/results/
 if there are any.