Fix WebUI crashing when SVG support is disabled (#15809)

Fixes #14910

app/javascript/mastodon/components/hashtag.js

@@ -2,10 +2,35 @@
 import React from 'react';
 import { Sparklines, SparklinesCurve } from 'react-sparklines';
 import { FormattedMessage } from 'react-intl';
+import PropTypes from 'prop-types';
 import ImmutablePropTypes from 'react-immutable-proptypes';
 import Permalink from './permalink';
 import ShortNumber from 'mastodon/components/short_number';
 
+class SilentErrorBoundary extends React.Component {
+
+  static propTypes = {
+    children: PropTypes.node,
+  };
+
+  state = {
+    error: false,
+  };
+
+  componentDidCatch () {
+    this.setState({ error: true });
+  }
+
+  render () {
+    if (this.state.error) {
+      return null;
+    }
+
+    return this.props.children;
+  }
+
+}
+
 /**
  * Used to render counter of how much people are talking about hashtag
  *
@@ -51,6 +76,7 @@ const Hashtag = ({ hashtag }) => (
     </div>
 
     <div className='trends__item__sparkline'>
+      <SilentErrorBoundary>
         <Sparklines
           width={50}
           height={28}
@@ -62,6 +88,7 @@ const Hashtag = ({ hashtag }) => (
         >
           <SparklinesCurve style={{ fill: 'none' }} />
         </Sparklines>
+      </SilentErrorBoundary>
     </div>
   </div>
 );