Description of problem:
Trying to complete a package name causes dnf to print out errors

Version-Release number of selected component (if applicable):
0.6.2-1

How reproducible:
Always

Steps to Reproduce:
1. Log in as root
2. Type "dnf install <any part of a package name>"
3. Press tab to complete the package name

Actual results:
"-cut: you must specify a list of bytes, characters, or fields
Try 'cut --help' for more information." is printed out instead of the package name.

Expected results:
It should complete the package name.

Additional info: