improve validation conditions for MetalLB BGP Peers (#8568)

roles/kubernetes-apps/metallb/tasks/main.yml

@@ -13,9 +13,10 @@
 
 - name: Kubernetes Apps | Check BGP peers for MetalLB
   fail:
-    msg: "metallb_peers is mandatory when metallb_protocol is bgp"
+    msg: "metallb_peers is mandatory when metallb_protocol is bgp and metallb_speaker_enabled"
   when:
-    - metallb_protocol == 'bgp' and metallb_peers is not defined
+    - metallb_protocol == 'bgp' and metallb_speaker_enabled
+    - metallb_peers is not defined or not metallb_peers
 
 - name: Kubernetes Apps | Check AppArmor status
   command: which apparmor_parser