Work around pylint all files deselected

pylintrc

@@ -14,7 +14,9 @@ ignore=CVS
 
 # Add files or directories matching the regex patterns to the blacklist. The
 # regex matches against base names, not paths.
-ignore-patterns=
+#
+# See https://github.com/carsongee/pytest-pylint/issues/137
+# ignore-patterns=
 
 # Python code to execute, usually for sys.path manipulation such as
 # pygtk.require().