k8s: Fix a bug when manifest file ends with '---'

changelogs/fragments/59160_handle_none_def.yml

@@ -0,0 +1,2 @@
+bugfixes:
+- raw - handle condition when definition is none (https://github.com/ansible/ansible/pull/59160).

plugins/module_utils/raw.py

@@ -171,6 +171,8 @@ def execute_module(self):
 
         flattened_definitions = []
         for definition in self.resource_definitions:
+            if definition is None:
+                continue
             kind = definition.get('kind', self.kind)
             api_version = definition.get('apiVersion', self.api_version)
             if kind.endswith('List'):