Description of problem:

Calling `systemctl edit some.service`, after upgrading systemd on my fedora-22 droplet to release `23.fc22`` will result in the following error message:

```
Failed to execute vim: Bad address
editor failed with error code 1.
```

`strace systemctl edit some.service | grep vim` gives the following hint:

```
ioctl(1, TCGETS, 0x7ffebaecd410)        = -1 ENOTTY (Inappropriate ioctl for device)
writev(2, [{"Cannot edit units if not on a tt"..., 33}, {"\n", 1}], 2Cannot edit units if not on a tty
) = 34
```

Version-Release number of selected component (if applicable):

23.fc22

How reproducible:

(replace `some.service` with an existing service name)

Steps to Reproduce:
1. systemctl edit some.service

Actual results:


Expected results:


Additional info:

`uname -a`: Linux klingt.net 4.1.6-200.fc22.x86_64 #1 SMP Mon Aug 17 19:54:31 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux