Only copy tokens if tokens_list contains any

roles/kubernetes/secrets/tasks/gen_tokens.yml

@@ -55,4 +55,4 @@
 - name: Gen_tokens | Copy tokens on masters
   shell: "echo '{{ tokens_data.stdout|quote }}' | base64 -d | tar xz -C /"
   when: inventory_hostname in groups['kube-master'] and sync_tokens|default(false) and
-        inventory_hostname != groups['kube-master'][0]
+        inventory_hostname != groups['kube-master'][0] and tokens_data.stdout != ''