In components\com_k2\templates\item.php

---Original:
	  	<ul>
			<?php foreach ($this->item->extra_fields as $key=>$extraField):?>
			<li class="<?php echo ($key%2) ? "odd" : "even"; ?> type<?php echo ucfirst($extraField->type); ?> group<?php echo $extraField->group; ?>">
				<span class="itemExtraFieldsLabel"><?php echo $extraField->name; ?>:</span>
				<span class="itemExtraFieldsValue"><?php echo $extraField->value; ?></span>
			</li>
			<?php endforeach; ?>
			</ul>


---Replaced with:
<ul>
	<?php foreach ($this->item->extra_fields as $key=>$extraField):?>
		<?php if((!empty($extraField->value)) && (($extraField->value) != "http://")) : ?>
			<?php $class = ($class == 'even') ? 'odd' : 'even'; ?>
			<li class="<?php echo $class; ?> type<?php echo ucfirst($extraField->type); ?> group<?php echo $extraField->group; ?>"> <span class="itemExtraFieldsLabel"><?php echo $extraField->name; ?>:</span> <span class="itemExtraFieldsValue"><?php echo $extraField->value; ?></span> <br class="clr" />
			</li>
		<?php else : ?>
			<?php /*?>If for some reason you wanted something else to show in place of an empty field, you would put it here. You may need to wrap it in an li for proper formatting<?php */?>
		<?php endif; ?>
	<?php endforeach; ?>
</ul>