It seems that you already know how to check whether variables exist,  so 
you have already answered the question.

However,  I think the entire premise of the question seems strange.  If you 
are the developer you should know what variables you are going to be using 
in the view?  So, just make sure they always exist so you don't have to 
mess up your view with all those tests.

Maybe if you doing something unusal it is better to state the use case?

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