Make linter happy

src/certificate.py

@@ -582,7 +582,7 @@ def _prepare_certificate_signing_request(domain, key_file, output_folder):
         base_dns_zone = _get_dns_zone_for_domain(domain)
         basename = _get_relative_name_for_dns_zone(domain, base_dns_zone)
         suffix = f".{basename}" if basename != "@" else ""
-        
+
         for sub in ("xmpp-upload", "muc"):
             subdomain = sub + "." + domain
             if xmpp_records.get("CNAME:" + sub + suffix) == "OK":

src/tools.py

@@ -606,6 +606,7 @@ def tools_shell(command=None):
         shell = code.InteractiveConsole(vars)
         shell.interact()
 
+
 def tools_basic_space_cleanup():
     """
     Basic space cleanup.