make sure peers is defined. (#11259)

* make sure peers is defined.

* Update peer_with_router.yml

roles/network_plugin/calico/tasks/peer_with_router.yml

@@ -19,7 +19,7 @@
   until: output.rc == 0
   delay: "{{ retry_stagger | random + 3 }}"
   with_items:
-    - "{{ peers | selectattr('scope', 'defined') | selectattr('scope', 'equalto', 'global') | list | default([]) }}"
+    - "{{ peers | default([]) | selectattr('scope', 'defined') | selectattr('scope', 'equalto', 'global') | list }}"
   when:
     - inventory_hostname == groups['kube_control_plane'][0]
 
@@ -107,7 +107,7 @@
   until: output.rc == 0
   delay: "{{ retry_stagger | random + 3 }}"
   with_items:
-    - "{{ peers | selectattr('scope', 'undefined') | list | default([]) | union(peers | selectattr('scope', 'defined') | selectattr('scope', 'equalto', 'node') | list | default([])) }}"
+    - "{{ peers | default([]) | selectattr('scope', 'undefined') | list | union(peers | default([]) | selectattr('scope', 'defined') | selectattr('scope', 'equalto', 'node') | list ) }}"
   delegate_to: "{{ groups['kube_control_plane'][0] }}"
   when:
     - inventory_hostname in groups['k8s_cluster']