Ignore error in cleaning task
Ignore error in cleaning task

If lib/src doesn't exist (which is initially the case you checkout the
repo), find will fail. Adding a dash in front of the command tells make
to keep executing the rest of the commands.

Anaethelion/Geotrek,mabhub/Geotrek,mabhub/Geotrek,Anaethelion/Geotrek,makinacorpus/Geotrek,GeotrekCE/Geotrek-admin,johan--/Geotrek,GeotrekCE/Geotrek-admin,Anaethelion/Geotrek,Anaethelion/Geotrek,johan--/Geotrek,mabhub/Geotrek,makinacorpus/Geotrek,makinacorpus/Geotrek,camillemonchicourt/Geotrek,makinacorpus/Geotrek,camillemonchicourt/Geotrek,johan--/Geotrek,camillemonchicourt/Geotrek,mabhub/Geotrek,GeotrekCE/Geotrek-admin,GeotrekCE/Geotrek-admin,johan--/Geotrek