Fix EndpointSpec KeyError. (ansible-collections#637)

Author: felixfontein

changelogs/fragments/637-swarm_info-endpoint_spec.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - "docker_swarm_info - if ``service=true`` is used, do not crash when a service without an endpoint spec is encountered (https://github.com/ansible-collections/community.docker/issues/636, https://github.com/ansible-collections/community.docker/pull/637)."

plugins/modules/docker_swarm_info.py

@@ -326,7 +326,7 @@ def get_essential_facts_services(item):
             # Number of replicas have to be updated in calling method or may be left as None
             object_essentials['Replicas'] = None
         object_essentials['Image'] = item['Spec']['TaskTemplate']['ContainerSpec']['Image']
-        if 'Ports' in item['Spec']['EndpointSpec']:
+        if item['Spec'].get('EndpointSpec') and 'Ports' in item['Spec']['EndpointSpec']:
             object_essentials['Ports'] = item['Spec']['EndpointSpec']['Ports']
         else:
             object_essentials['Ports'] = []