Remove/disable Zone/State?

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#zone_id {
visibility:hidden;
}

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If ($this->request->post['zone_id'] == 'FALSE') {
    	$this->error['zone'] = $this->language->get('error_zone');
}

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          <tr>
            <td><span class="required">*</span> <?php echo $entry_zone; ?></td>
            <td><select name="zone_id">
              </select>
              <?php if ($error_zone) { ?>
              <span class="error"><?php echo $error_zone; ?></span>
              <?php } ?></td>
          </tr>

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<input type="hidden" name="zone_id" value="0" />

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Notice: Undefined index: zone_id in /catalog/model/shipping/free.php on line 7

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<?php
class ModelShippingFree extends Model {
	function getQuote($address) {
		$this->load->language('shipping/free');
		
		if ($this->config->get('free_status')) {
      		$query = $this->db->query("SELECT * FROM " . DB_PREFIX . "zone_to_geo_zone WHERE geo_zone_id = '" . (int)$this->config->get('free_geo_zone_id') . "' AND country_id = '" . (int)$address['country_id'] . "' AND (zone_id = '" . (int)$address['zone_id'] . "' OR zone_id = '0')");
		
      		if (!$this->config->get('free_geo_zone_id')) {
        		$status = TRUE;
      		} elseif ($query->num_rows) {
        		$status = TRUE;
      		} else {
        		$status = FALSE;
      		}
		} else {
			$status = FALSE;
		}

		if ($this->cart->getSubTotal() < $this->config->get('free_total')) {
			$status = FALSE;
		}
		
		$method_data = array();
	
		if ($status) {
			$quote_data = array();
			
      		$quote_data['free'] = array(
        		'id'           => 'free.free',
        		'title'        => $this->language->get('text_description'),
        		'cost'         => 0.00,
        		'tax_class_id' => 0,
				'text'         => $this->currency->format(0.00)
      		);

      		$method_data = array(
        		'id'         => 'free',
        		'title'      => $this->language->get('text_title'),
        		'quote'      => $quote_data,
				'sort_order' => $this->config->get('free_sort_order'),
        		'error'      => FALSE
      		);
		}
	
		return $method_data;
	}
}
?>