Add missing directory field (#7687)

Fixes #7683.

* Add missing directory field to error message

* Added change to CHANGELOG.md

acme/acme/messages.py

@@ -251,7 +251,7 @@ class Directory(jose.JSONDeSerializable):
         try:
             return self._jobj[self._canon_key(name)]
         except KeyError:
-            raise KeyError('Directory field not found')
+            raise KeyError('Directory field "' + self._canon_key(name) + '" not found')
 
     def to_partial_json(self):
         return self._jobj

certbot/CHANGELOG.md

@@ -10,7 +10,7 @@ Certbot adheres to [Semantic Versioning](https://semver.org/).
 
 ### Changed
 
-*
+* Add directory field to error message when field is missing.
 
 ### Fixed