Once you've constructed the filename, $fn, you can use a file test operator to check if it exists.
my $fn = make_filename($user); # or whatever
$fn = '/path/to/default.jpg' unless -f $fn;
print link_pic($fn);
to link a default image, or
if ( -f $fn ) {
print link_pic($fn);
}
to simply leave out the link.
After Compline,
Zaxo
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