Update _ambiguous_type_genome.html.erb

Author: lmrodriguezr

app/views/registers/curation_genomics/_ambiguous_type_genome.html.erb

@@ -38,7 +38,7 @@
           <% cr.each { |rel| %>AAI to <%= rel[0] %>: <%= rel[1] %>%<br/><% } %>
         </td>
         <td>
-          <%= genome.miga_object&.metadata&.[](:tax) %><hr/>
+          <%= (genome.miga_object&.metadata || {})[:tax] %><hr/>
           <% cr = genome.miga_object&.closest_relatives(3, true, :aai) || [] %>
           <% cr.each { |rel| %>AAI to <%= rel[0] %>: <%= rel[1] %>%<br/><% } %>
         </td>