I want to do some check using remote environment variables, which can be
read from format like this
{{ ansible_env.NGINX_HOME }}
This "path" or environment variable can be absent, and that's the purpose
of that check anyway.
But Ansible treat this as a fatal error, showing error message like
*One or more undefined variables: 'dict object' has no attribute
'NGINX_HOME'*
What can I do to just skip this?
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