Fix python unparsed serialization (#569)

* Fix serialization of unparsed object

We need to handle the case when a dict is given directly.

* Fix typo

* Regenerate client from commit ac1d9d2 of spec repo

Co-authored-by: Thomas Hervé <[email protected]>
Co-authored-by: ci.datadog-api-spec <[email protected]>
Co-authored-by: api-clients-generation-pipeline[bot] <54105614+api-clients-generation-pipeline[bot]@users.noreply.github.com>

Author: 3 people

.apigentools-info

@@ -4,13 +4,13 @@
     "spec_versions": {
         "v1": {
             "apigentools_version": "1.4.1.dev11",
-            "regenerated": "2021-08-27 15:13:58.591040",
-            "spec_repo_commit": "04b2dd3"
+            "regenerated": "2021-09-03 09:50:49.531327",
+            "spec_repo_commit": "ac1d9d2"
         },
         "v2": {
             "apigentools_version": "1.4.1.dev11",
-            "regenerated": "2021-08-27 15:14:22.742779",
-            "spec_repo_commit": "04b2dd3"
+            "regenerated": "2021-09-03 09:51:07.940892",
+            "spec_repo_commit": "ac1d9d2"
         }
     }
 }

.generator/templates/model_utils.mustache

@@ -1493,8 +1493,10 @@ def model_to_dict(model_instance, serialize=True):
                            res.append(v)
                        elif isinstance(v, ModelSimple):
                            res.append(v.value)
-                       else:
+                       elif isinstance(v, OpenApiModel):
                            res.append(model_to_dict(v, serialize=serialize))
+                       else:
+                           res.append(v)
                    result[attr] = res
             elif isinstance(value, dict):
                 result[attr] = dict(map(
@@ -1659,7 +1661,7 @@ def get_oneof_instance(cls, model_kwargs, constant_kwargs, model_arg=None):
                         configuration=constant_kwargs['_configuration']
                     )
             if not oneof_instance._unparsed:
-	        oneof_instances.append(oneof_instance)
+                oneof_instances.append(oneof_instance)
         except Exception:
             pass
     if len(oneof_instances) != 1: