Isolate that which changes.
If name, mail, phone are common to both cases then can you not get on and print them anyway?
PHP Code:
<td class="peoplename"><?php echo $item->name; ?></td>
<td class="peopleemailto"><a href="mailto?php echo $item->email_to; ?>"><?php echo $item->email_to; ?></a></td>
<td class="peopletelephone"><?php echo $item->telephone; ?></td>
<!-- only have this one condition -->
<?php if (isset($item->webpage)) : ?>
<td class="peoplewebpage"><a href="<?php echo JRoute::_(''); ?>"><img src="/images/powered_by.png"></a></td>
<?php endif; ?>
Top tip: To format code on here, wrap your php code in the tags [ php ] [ /php ] (without the spaces)
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