Fix 'content' not found in map error

If proxy_hiddenservice is undefined for some reason, ansible complains while contructing templates if a property of this object is used although there might be checks to prevent this.

I propose to simply update the check for undefined variables to mitigate this. An alternative would be to figure out, why ansible is behaving this way.

The question is, why is ansible evaluating proxy_hiddenservice.content in the templates, although proxy_hiddenservice is undefined and there are checks to make sure this is handled?

Signed-off-by: Alexander Wellbrock a.wellbrock@mailbox.org