From 2c115bb64890eb9e57ffbc0af16a32e141939d5b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marek=20Marczykowski-G=C3=B3recki?=
 <marmarek@invisiblethingslab.com>
Date: Fri, 17 Mar 2017 12:49:28 +0100
Subject: [PATCH] mgmt: allow functions to return None if no data is to be
 returned

Don't force `return ''` everywhere.

QubesOS/qubes-issues#2622
---
 qubes/tools/qubesd.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/qubes/tools/qubesd.py b/qubes/tools/qubesd.py
index b72cd9ba..f91f6e5e 100644
--- a/qubes/tools/qubesd.py
+++ b/qubes/tools/qubesd.py
@@ -117,7 +117,8 @@ class QubesDaemonProtocol(asyncio.Protocol):
 
     def send_response(self, content):
         self.send_header(0x30)
-        self.transport.write(content.encode('utf-8'))
+        if content is not None:
+            self.transport.write(content.encode('utf-8'))
 
     def send_event(self, subject, event, **kwargs):
         self.send_header(0x31)