Reverting a previous change to ensure a parameter is a list

homeassistant/util.py

@@ -1,3 +1,6 @@
+def ensure_list(parameter):
+	return parameter if isinstance(parameter, list) else [parameter]
+
 def matcher(subject, pattern):
     """ Returns True if subject matches the pattern.
         Pattern is either a list of allowed subjects or a '*'. """