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how to do isset function for new custom hook


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I am able to add and display a hook using the following line

{hook h="DisplayProductTabArticle"}  


but how can I set an isset function around it?

so that that hook will only display when there is content, and when there is no content, I want to display something else.


i have tried the following, but it is always go to the else statement.

{if isset(DisplayProductTabArticle)}






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