message: Fix distributed tracing link displayed with no url
  Fixes
diff: @@ -60,10 +60,10 @@ class Menu extends React.Component<MenuProps, MenuState> {
  })
  .map(item => {
  if (item.title === 'Distributed Tracing') {
  - return this.props.jaegerUrl !== '' ? (
  + return (
  + this.props.jaegerUrl && (
  <ExternalLink key={item.to} href={this.props.jaegerUrl} name="Distributed Tracing" />
  - ) : (
  - ''
  + )
  );
  }
  