wsgi: Improve coding style.

caucase/wsgi.py

@@ -169,8 +169,7 @@ class Application(object):
         request_method = environ['REQUEST_METHOD']
         if request_method == 'OPTIONS':
           status = STATUS_NO_CONTENT
-          header_list = [
-          ]
+          header_list = []
           result = []
         else:
           try:
@@ -198,11 +197,7 @@ class Application(object):
       status = e.status
       header_list = e.response_headers
       result = [str(x) for x in e.args]
-    start_response(
-      status,
-      header_list + [
-      ],
-    )
+    start_response(status, header_list)
     return result
 
   @staticmethod