Hide "Data updated" for invalid dates

A bad value could show as an inaccuracy such as "Data updated today",
which shouldn't be allowed. I found this out upon looking at the mers
example dataset provided by get-data.sh.

package.json

@@ -90,6 +90,7 @@
     "lodash": "^4.17.21",
     "lodash-webpack-plugin": "^0.11.6",
     "marked": "^0.7.0",
+    "moment": "^2.29.4",
     "mousetrap": "^1.6.2",
     "null-loader": "^4.0.0",
     "outer-product": "0.0.4",

src/components/framework/fine-print.js

@@ -3,6 +3,7 @@ import { connect } from "react-redux";
 import styled from 'styled-components';
 import { withTranslation } from "react-i18next";
 import { FaDownload } from "react-icons/fa";
+import moment from "moment";
 import { dataFont, medGrey, materialButton } from "../../globalStyles";
 import { TRIGGER_DOWNLOAD_MODAL } from "../../actions/types";
 import Flex from "./flex";
@@ -72,7 +73,7 @@ class FinePrint extends React.Component {
 
   getUpdated() {
     const { t } = this.props;
-    if (this.props.metadata.updated) {
+    if (moment(this.props.metadata.updated).isValid()) {
       return (<span>{t("Data updated")} {this.props.metadata.updated}</span>);
     }
     return null;

src/components/info/byline.js

@@ -2,6 +2,7 @@ import React from "react";
 import { connect } from "react-redux";
 import { withTranslation } from 'react-i18next';
 import styled from 'styled-components';
+import moment from "moment";
 import { headerFont } from "../../globalStyles";
 
 /**
@@ -107,7 +108,7 @@ function renderMaintainers(t, metadata) {
  * Renders a <span> containing "Data updated X", where X derives from `metadata.updated`
  */
 function renderDataUpdated(t, metadata) {
-  if (metadata.updated) {
+  if (moment(metadata.updated).isValid()) {
     return (
       <span>
         {`${t("Data updated")} ${metadata.updated}. `}