Check existance of layout variable?

Question

Is it possible to do something like the following (which doesn't work).

{if layout:contents}
    {layout:contents}
{if:else}
    404!
{/if}

thanks!

:: ed

Answer 1

{layout:contents} is no regular layout variable (it will always contain the entire contents of the template in which the {layout="template_group/template"} tag appeared), which is why I suspect your code sample doesn't work.

But all other layout variables should work just fine as conditionals, as in your code sample.