Bug#872273: fixed in slic3r 1.2.9+dfsg-7

[Petter Reinholdtsen]

Control: found -1 1.2.9+dfsg-7
Control: notfound -1 1.2.9+dfsg-6

Note that the bug was found in testing, and is not present in stable, to make
it clear that this RC bug do not affect stable.
-- 
Happy hacking
Petter Reinholdtsen