From 6c564c7b7f53c64fe5ada6b8ff0c520f69d70f56 Mon Sep 17 00:00:00 2001
From: Otto Winter <otto@otto-winter.com>
Date: Mon, 3 Jun 2019 09:41:33 +0200
Subject: [PATCH] Fix validation infinite loop with empty platform block (#598)

* Fix validation infinite loop with empty platform block

* Update util.py
---
 esphome/util.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/esphome/util.py b/esphome/util.py
index bad660cd5a..0ae0b9e32e 100644
--- a/esphome/util.py
+++ b/esphome/util.py
@@ -187,6 +187,8 @@ class OrderedDict(collections.OrderedDict):
 
     def move_to_end(self, key, last=True):
         if IS_PY2:
+            if len(self) == 1:
+                return
             if last:
                 # When moving to end, just pop and re-add
                 val = self.pop(key)