Fix KeyError for unsupported annotation types.

vision/google/cloud/vision/annotations.py

@@ -87,6 +87,9 @@ def from_api_repr(cls, response):
         :rtype: :class:`~google.cloud.vision.annotations.Annotations`
         :returns: An instance of ``Annotations`` with detection types loaded.
         """
+        for feature_type in response.keys():
+            if feature_type not in _KEY_MAP:
+                del response[feature_type]
         annotations = {
             _KEY_MAP[feature_type]: _entity_from_response_type(
                 feature_type, annotation)

vision/unit_tests/test_annotations.py

@@ -66,6 +66,15 @@ def test_ctor(self):
         self.assertEqual(annotations.safe_searches, [True])
         self.assertEqual(annotations.texts, [True])
 
+    def test_unsupported_http_annotation(self):
+        returned = {
+            'responses': [
+                {'someMadeUpAnnotation': None},
+            ],
+        }
+        annotation = self._get_target_class().from_api_repr(returned)
+        self.assertIsInstance(annotation, self._get_target_class())
+
     def test_from_pb(self):
         from google.cloud.vision.likelihood import Likelihood
         from google.cloud.vision.safe_search import SafeSearchAnnotation