[Rpm-maint] [rpm-software-management/rpm] rpm without TTY gives wrong error message (#355)

[Panu Matilainen]

First part was already fixed in commit df053dd36461042e4d11a21a97e9be9058204658, second half now in commit b89eb35c6034d43a8048ac9d452a1921596071a7:

```
[pmatilai at sopuli rpm]$ ./rpm -e mlocate
error: can't create transaction lock on /var/lib/rpm/.rpm.lock (Permission denied)
[pmatilai at sopuli rpm]$ ./rpm -e mlocate < /dev/null
error: can't create transaction lock on /var/lib/rpm/.rpm.lock (Permission denied)
```

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