Suggested fix for empty domain

Signed-off-by: delphi <cpp.create@gmail.com>

esphome/config.py

@@ -452,6 +452,8 @@ def validate_config(config):
         # Ensure conf is a list
         if not isinstance(conf, list) and conf:
             result[domain] = conf = [conf]
+        elif not conf:
+            result[domain] = conf = []
 
         for i, p_config in enumerate(conf):
             path = [domain, i]

tests/test2.yaml

@@ -238,3 +238,6 @@ interval:
   interval: 5s
   then:
     - logger.log: "Interval Run"
+
+display:
+