Display 'add to cart' button for free products

-- HikaShop version -- : 2.6.0
-- Joomla version -- : 3.4.5

Hi I have Display 'add to cart' button for free products = No in the Config file however products with a price of 0.00 are still showing the add to cart button.

Is this a bug or is there some other setting I am missing?
I am trying to achieve:
If a price is set to 0.00
1. hide the price and
2. hide the add to cart button.

If I could get the "Display 'add to cart' button for free products = No" function working I can figure out how to hide the price then.

I can confirm I have no template overrides setup in my template html dir.
Thanks for any help

I have used the following to hide my price value = 0.00
Got the element property from
www.hikashop.com/support/documentation/157
price_value

Made a template override for
templates/mytemplate/html/com_hikashop/product/listing_price.php

Then after line 46

<?php
	if(empty($this->row->prices)){
		echo JText::_('FREE_PRICE');
	}

if (($this->row->prices->price_value == 0.00 )){
			
		echo JText::_('FREE_PRICE');}

Ok I see that now and I can confirm the Add to Cart function no longer displays.
However as i am importing hundreds or products for future reference is there a mass action that can set the price_value field to blank.
It seems price_value requires a decimal hence all the prices on import are set to 0.0000

e.g I tried Mass Action > Update the Values > price_value = Null

I found the only way to mass remove prices from free products was to execute a dump of the table
DELETE FROM `jos_database`.`jos_hikashop_price` WHERE `jos_hikashop_price`.`price_value` = 0.0000;

Thanks for the support!