An example of how to get around displaying erroneous html in AMP Templates.

foster-parent-noDisplay-example

CSS : 
<style>
	.noDisplay : { display: none; }
</style>

JSON :
{
	"items": [{
      {
        "priceType:"",
        "price": "1.99",
      },
      {
        "priceType":"Card",
        "price": "2.99",
      },
      {
        "priceType":"BitCoin",
        "price": "5.99",
      }
  }]
}

AMP List Template : 
<template type="amp-mustache">
	<table>
		<tr class=”noDisplay{{priceType}}”>
			<td>{{priceType}}:</td>
			<td>$ {{price}}</td>
        </tr>	
	</table>
</template>

Resulting HTML: 
<table>
	<tr class=”noDisplay”>
		<td></td>
		<td>1.99</td>
	</tr>
	<tr class=”noDisplayCard”>
		<td>Card</td>
		<td>2.99</td>
	</tr>
	<tr class=”noDisplayBitCoin”>
		<td>BitCoin</td>
		<td>5.99</td>
	</tr>
</table>