add custom template tag to get ordered air quality indices

combo_plugin_gnm/templatetags/gnm.py

@@ -716,3 +716,9 @@ def get_goto_cell(page, request):
 @register.assignment_tag
 def get_collectivity_slugs():
     return COLLECTIVITY_LABELS.keys()
+
+@register.filter
+def indice_values(indices):
+    for key in ('indice_j-1', 'indice_j', 'indice_j+1'):
+        if indices.get(key):
+            yield indices.get(key)