Again, I’m not familiar with Advanced Custom Fields but you may be able to store the returned value into a variable then test if that variable is empty, like so:
<?php
$pista1a = types_render_field("pista-1a", array("argument1"=>"value1","argument2"=>"value2","argument2"=>"value2"));
?>
<ul>
<?php if( ! empty( $pista1a ) ) : ?>
<li>
<?php echo $pista1a; ?>
</li>
<?php endif; ?>
</ul>
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