How to hide the Subject of "Request More Details"

The Subject line generated from the "Request More Details" form is unnecessary in my case.
Is there a way to hide it without a hack?
If hack required, please indicate the file and code lines.

Hi Tami,
You can remove the options in the drop-down at "Request more details" form in this file
components > com_osproperty > templates > your_current_template > details.html.tpl.php
find:
<select name='subject' id='subject' class='input-medium' onchange="javascript:updateRequestForm(this.value)">
<option value='1'><?php echo JText::_('OS_REQUEST_1')?></option>
<option value='2'><?php echo JText::_('OS_REQUEST_2')?></option>
<option value='3'><?php echo JText::_('OS_REQUEST_3')?></option>
<option value='4'><?php echo JText::_('OS_REQUEST_4')?></option>
<option value='5'><?php echo JText::_('OS_REQUEST_5')?></option>
<option value='6'><?php echo JText::_('OS_REQUEST_6')?></option>
</select>

depend on the content of options (were defined at language files), you can remove corresponding options if you need.
Thanks
Dam

In Version 3.18.0 is this in small.details.html.tpl.php

And there is a bug in com_osproperty/helpers/common.php
Line 3590

for($i=1;$i<=7;$i++){