From ccad2ed824f1601d2cc29aafe5dff6ef46668f5e Mon Sep 17 00:00:00 2001
From: Luke Barnard <lukeb@openmarket.com>
Date: Wed, 10 May 2017 17:34:30 +0100
Subject: [PATCH] Modify condition on empty localpart

---
 synapse/handlers/register.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/synapse/handlers/register.py b/synapse/handlers/register.py
index dd84c5f5e9ba..ee3a2269a847 100644
--- a/synapse/handlers/register.py
+++ b/synapse/handlers/register.py
@@ -54,7 +54,7 @@ def check_username(self, localpart, guest_access_token=None,
                 Codes.INVALID_USERNAME
             )
 
-        if len(localpart) == 0:
+        if not localpart:
             raise SynapseError(
                 400,
                 "User ID cannot be empty",