This is what i have used for checking to see if the custom field is there or not. I am sure you can use it as well.
<?php
$custom_field = get_post_meta($post->ID, 'Your Custom Field Name', true);
// Checks to see if there is a value in the custom field
if($custom_field != '') { echo $custom_field; }
?>
It probably would look something like this with your code above:
<ul>
<li><span class="icon" style="background-image:url(<?php
$custom_field = get_post_meta($post->ID, 'Your Custom Field Name', true);
// Checks to see if there is a value in the custom field
if($custom_field != '') { echo $custom_field; }
?>);"> </span><a href="https://wordpress.stackexchange.com/questions/73316/link">link</a></li>
</ul>
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