fix: add if for areaCode since it can be none

In the case of taxoRankSheet

Author: Maxime Vergez

atlas/templates/core/listTaxons.html

@@ -18,7 +18,7 @@
     <div id="taxonList" class="d-flex align-content-stretch bg-white flex-grow-1">
         <ul class="list-group w-100">
             {% for taxon in listTaxons.taxons %}
-                <li id="taxonListItem" class="media border-bottom p-2" area-code="{{ areaInfos.areaCode }}"
+                <li id="taxonListItem" class="media border-bottom p-2" {% if areaInfos is defined %} area-code="{{ areaInfos.areaCode }}" {% endif %}
                     cdRef="{{ taxon.cd_ref }}" {% if configuration.INTERACTIVE_MAP_LIST %}data-toggle="tooltip"
                     data-original-title="{{ _('display.municipality.obs') }}"{% endif %}>
                 <span class="d-none">{{ taxon.group2_inpn }}</span>