get_post_meta printing empty fields, but it shouldn’t be

The get_post_meta function returns an empty string if the key has not yet been set. That means the unused fields are going to result in $link having a value of ”, NOT a value of NULL.

The isset function returns TRUE if the variable exists and has value other than NULL. As $link is not NULL (it’s ”), isset will return TRUE and your code will run.

Perhaps you should use empty instead of isset, although for some reason, I typically use the following:

if (isset($link) && $link != '')

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