Description of problem:
Future warning is printed if dnf is called with argument --exclude


Version-Release number of selected component (if applicable):
dnf-1.1.6-2.fc24.noarch
python3-3.5.1-6.fc24.x86_64

How reproducible:
Deterministic

Steps to Reproduce:
1. dnf update --exclude=dummy_name
# it can be also name of real package

Actual results:
/usr/lib64/python3.5/re.py:203: FutureWarning: split() requires a non-empty pattern match.
  return _compile(pattern, flags).split(string, maxsplit)

Expected results:
There isn't any warning.