Try this.
Code:
{if $product_wholesale ne ""}
<table border=0 cellpadding=2 cellspacing=2>
<tr class=TableHead>
<td align=right>Quantity:</td>
<td align=right>Price:</td>
{section name=wi loop=$product_wholesale}
<tr>
<td>{$product_wholesale[wi].quantity}{if $smarty.section.wi.last}+{else}-{$product_wholesale[wi].next_quantity}{/if}</td>
<td>{include file="currency.tpl" value=$product_wholesale[wi].price}</td>
</tr>
{/section}
</table>
{/if}