Description of problem:
Systemd bogus "No [Install] section" warning when enabling a unit with full path, like "systemctl enable /some/path/myunit.service"

Version-Release number of selected component (if applicable):
systemd-219-30.el7.x86_64

How reproducible:
By making a customised service file at location other than /etc/systemd/system and /usr/lib/systemd/system

Steps to Reproduce:

echo "
[Unit]
Description=Demo service

[Service]
User=root
ExecStart=/usr/bin/ls /tmp/ > /dev/null

[Install]
WantedBy=multi-user.target
" > /demo.service

Actual results:

systemctl enable /demo.service
Created symlink from /etc/systemd/system/multi-user.target.wants/demo.service to /demo.service.
Created symlink from /etc/systemd/system/demo.service to /demo.service.
The unit files have no [Install] section. They are not meant to be enabled
using systemctl.
Possible reasons for having this kind of units are:
1) A unit may be statically enabled by being symlinked from another unit's
   .wants/ or .requires/ directory.
2) A unit's purpose may be to act as a helper for some other unit which has
   a requirement dependency on it.
3) A unit may be started when needed via activation (socket, path, timer,
   D-Bus, udev, scripted systemctl call, ...).


Expected results:
systemctl enable /demo.service
Created symlink from /etc/systemd/system/multi-user.target.wants/demo.service to /demo.service.
Created symlink from /etc/systemd/system/demo.service to /demo.service.

Additional info:
The misleading error is "The unit files have no [Install] section." 
The service unit is having [Install] section , still its reporting false error.

After enabling the service , we can execute - systemctl start demo.service flawlessly

see https://github.com/systemd/systemd/pull/3016 
A fix has been applied in systemd-230 and later, this is available in fedora25. When can we expect this fix in redhat?