$ sudo dnf builddep util-linux

Traceback (most recent call last):
  File "/bin/dnf", line 35, in <module>
    main.user_main(sys.argv[1:], exit_code=True)
  File "/usr/lib/python3.4/site-packages/dnf/cli/main.py", line 198, in user_main
    errcode = main(args)
  File "/usr/lib/python3.4/site-packages/dnf/cli/main.py", line 84, in main
    return _main(base, args)
  File "/usr/lib/python3.4/site-packages/dnf/cli/main.py", line 136, in _main
    cli.run()
  File "/usr/lib/python3.4/site-packages/dnf/cli/cli.py", line 1091, in run
    return self.command.run(self.base.extcmds)
  File "/usr/lib/python3.4/site-packages/dnf-plugins/builddep.py", line 76, in inner
    return func(*args, **kwds)
  File "/usr/lib/python3.4/site-packages/dnf-plugins/builddep.py", line 142, in run
    self._remote_deps(pkgspec)
  File "/usr/lib/python3.4/site-packages/dnf-plugins/builddep.py", line 213, in _remote_deps
    package).get_best_query(self.base.sack)})
  File "/usr/lib/python3.4/site-packages/dnf-plugins/builddep.py", line 212, in <setcomp>
    for pkg in dnf.subject.Subject(
  File "/usr/lib/python3.4/site-packages/dnfpluginscore/lib.py", line 170, in package_source_name
    srcname = package.sourcerpm.rstrip(".src.rpm")
AttributeError: 'NoneType' object has no attribute 'rstrip'