Here are multiple ways you can do it.

Code:
if (!$hget(Table,Item)) { do this }


Code:
if ($hget(Table,Item) == $null) { do this }


Code:
if ($hfind(Table,*Wildcarded item to find*,0,w) == 0) { do this }


Code:
if ($hfind(Table,*Wildcarded data to find*,0,w).data == 0) { do this }

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