Adds workaround for requires_ansible

Collections on galaxy.ansible.com may not have the expected
`requires_ansible` data.

closes #806

CHANGES/806.bugfix

@@ -0,0 +1,2 @@
+Adds workaround to handle collections that do not have a ``requires_ansible`` in the
+``meta/runtime.yml`` data. This can happen in collections from ``galaxy.ansible.com``.

pulp_ansible/app/tasks/collections.py

@@ -1046,7 +1046,10 @@ def _post_save(self, batch):
                     )
                     if runtime_metadata:
                         runtime_yaml = yaml.safe_load(runtime_metadata)
-                        collection_version.requires_ansible = runtime_yaml.get("requires_ansible")
+                        if runtime_yaml:
+                            collection_version.requires_ansible = runtime_yaml.get(
+                                "requires_ansible"
+                            )
                     manifest_data = json.load(
                         get_file_obj_from_tarball(tar, "MANIFEST.json", artifact.file.name)
                     )

pulp_ansible/tests/functional/api/collection/v2/test_sync.py

@@ -134,6 +134,21 @@ def test_sync_with_invalid_requirements(self):
         )
         self.assertRaises(ApiException, self.remote_collection_api.create, body)
 
+    def test_sync_collection_missing_requires_ansible(self):
+        """Sync a collection with the expected `requires_ansible` data missing."""
+        body = gen_ansible_remote(
+            url="https://galaxy.ansible.com",
+            requirements_file="collections:\n  - name: inexio.thola\n    version: 1.0.0",
+            sync_dependencies=False,
+        )
+        remote = self.remote_collection_api.create(body)
+        self.addCleanup(self.remote_collection_api.delete, remote.pulp_href)
+
+        repo = self._create_repo_and_sync_with_remote(remote)
+
+        content = self.cv_api.list(repository_version=f"{repo.pulp_href}versions/1/")
+        self.assertGreaterEqual(len(content.results), 1)
+
     @unittest.skipUnless(
         "MIRROR_GALAXY" in os.environ,
         "'MIRROR_GALAXY' env var is not defined",