Making sure all paths return something

Callers may rely on being able to iterate over the result of this function.

flask_sockets.py

@@ -37,6 +37,7 @@ class SocketMiddleware(object):
             environment = environ['wsgi.websocket']
 
             handler(environment)
+            return []
         else:
             return self.app(environ, start_response)
 
@@ -64,4 +65,4 @@ class Sockets(object):
 
 # CLI sugar.
 if 'Worker' in locals():
-    worker = Worker
+    worker = Worker