You can't avoid that template error when using ezhttp. The code for the operator does a $http->has(Post|Get|Session)Variable() and prints the error in the else branch.
Doing an is_set on the result of ezhttp can't aleviate the problem because the error comes from the ezhttp operator itself.
It annoys me too, but it really isn't a problem with your code, nor in eZ publish's code.
Ok I understand the nature of the error message,
and the bad use of the ezhttp() function in my template code, but there is only one alternative way to test the existence of a variable in post into templates...the definition of a custom template
function...right?
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