Skip removing nodes if cluster is not set (#9430)

roles/remove-node/pre-remove/tasks/main.yml

@@ -3,6 +3,8 @@
   command: >-
     {{ kubectl }} get nodes -o go-template={% raw %}'{{ range .items }}{{ .metadata.name }}{{ "\n" }}{{ end }}'{% endraw %}
   register: nodes
+  when:
+    - groups['kube_control_plane'] | length > 0
   delegate_to: "{{ groups['kube_control_plane']|first }}"
   changed_when: false
   run_once: true
@@ -15,8 +17,10 @@
       --grace-period {{ drain_grace_period }}
       --timeout {{ drain_timeout }}
       --delete-emptydir-data {{ kube_override_hostname|default(inventory_hostname) }}
-  # ignore servers that are not nodes
-  when: kube_override_hostname|default(inventory_hostname) in nodes.stdout_lines
+  when:
+    - groups['kube_control_plane'] | length > 0
+    # ignore servers that are not nodes
+    - kube_override_hostname|default(inventory_hostname) in nodes.stdout_lines
   register: result
   failed_when: result.rc != 0 and not allow_ungraceful_removal
   delegate_to: "{{ groups['kube_control_plane']|first }}"
@@ -34,5 +38,6 @@
   retries: 3
   delay: "{{ drain_grace_period }}"
   when:
+    - groups['kube_control_plane'] | length > 0
     - not allow_ungraceful_removal
     - kube_override_hostname|default(inventory_hostname) in nodes.stdout_lines