fix broken test

letsencrypt/storage.py

@@ -260,7 +260,7 @@ class RenewableCert(object):  # pylint: disable=too-many-instance-attributes
 
         :returns: The path to the current version of the specified
             member.
-        :rtype: str
+        :rtype: str or None
 
         """
         if kind not in ALL_FOUR:

letsencrypt/tests/renewer_test.py

@@ -764,6 +764,8 @@ class RenewableCertTests(BaseRenewableCertTest):
 
     def test_bad_config_file(self):
         from letsencrypt import renewer
+        os.unlink(os.path.join(self.cli_config.renewal_configs_dir,
+                               "example.org.conf"))
         with open(os.path.join(self.cli_config.renewal_configs_dir,
                                "bad.conf"), "w") as f:
             f.write("incomplete = configfile\n")