<% if @taxon.hero %>
<div class='hero-image' style="background-image: url(<%= @taxon.hero.url %>)"></div>
<% end %>

<% if @taxon.hero && @taxon.hero.url %>
<div class='hero-image' style="background-image: url(<%= @taxon.hero.url %>)"></div>
<% end %>

Fix display of taxons without a hero image.
Fix display of taxons without a hero image.
