Remove 'Answer Rate' chart if no moments have been sent yet in results page

respuestas.php

 	
 		<div class="container" style="margin-top: 8rem;">
 		
-			<!-- CHART -->
+			<!-- TITLE + EXPORT RAW -->
 			<div class="row">
 				<div class="col-sm-10">
 					<h2>
 			let momentIDToNumber = {};
 			let number = 1; // start at 1
 			
+			// If no moments have been sent yet, remove chart
+			if(dataSet === null) {
+				document.getElementById('myChart2').remove();
+				return;
+			}
+			
 			// Fill Data Containers
 			dataSet.forEach(function(point) {