don't assume all delegation subkeys exist (#43032)

* don't assume all delegation subkeys exist

fixes #43026

* add tests

test/integration/targets/delegate_to/delegate_and_nolog.yml

@@ -0,0 +1,8 @@
+- hosts: testhost
+  gather_facts: false
+  tasks:
+    - name: no log filtering caused delegation to fail https://github.com/ansible/ansible/issues/43026
+      become: False
+      no_log: true
+      debug:
+      delegate_to: localhost

test/integration/targets/delegate_to/runme.sh

@@ -8,3 +8,5 @@ ANSIBLE_SSH_ARGS='-C -o ControlMaster=auto -o ControlPersist=60s -o UserKnownHos
 ansible-playbook test_loop_control.yml -v "$@"
 
 ansible-playbook test_delegate_to_loop_randomness.yml -v "$@"
+
+ansible-playbook delegate_and_nolog.yml -v "$@"