[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

pubtools/_pulp/step.py

@@ -6,6 +6,7 @@
 LOG = logging.getLogger("pubtools.pulp")
 UNSET = object()
 
+
 class StepDecorator(object):
     """Implementation of PulpTask.step decorator. See that method for more info."""