Only pull down github keys when the user is supposed to be a github user.

playbooks/roles/user/tasks/main.yml

@@ -126,7 +126,7 @@
     url: "https://github.com/{{ item.name }}.keys"
     return_content: true
   # We don't care if absent users lack ssh keys
-  when: item.get('state', 'present') == 'present'
+  when: item.get('state', 'present') == 'present' and item.github is defined
   with_items: "{{ user_info }}"
   register: github_users_return