Spurious directory created when running rake install_server

As pointed out in the following comment: #395 (comment 160894) there is empty directory created when running rake install_server.

The original report:

Extra directory. I did install stork the following way:

rake install_server DESTDIR=/home/thomson/stork-0.11

The contents was installed properly, but there was an extra directory created: /home/thomson/stork-0.11/home/thomson/devel/stork-0.11.0/tools/node-v12.16.2-linux-x64

The dir is empty, though. There's a bug somewhere in the install scripts.