Bugfix: https://nibio.atlassian.net/browse/VIPSUTV-158

observations/views.py

@@ -44,7 +44,7 @@ def index(request):
         organization_id = settings.VIPS_ORGANIZATION_ID
     
     date_from = datetime.strptime(request.GET.get("from", "%s-01-01" % (datetime.now() + relativedelta(months = settings.SYSTEM_TIME_OFFSET_MONTHS)).year),"%Y-%m-%d")
-    if request.GET.get("to", None) is not None:
+    if request.GET.get("to", None) is not None and len(request.GET.get("to", None).strip()) > 0:
         date_to = datetime.strptime(request.GET["to"], "%Y-%m-%d")
     else:
         date_to = datetime.now() + relativedelta(months = settings.SYSTEM_TIME_OFFSET_MONTHS) + relativedelta(days=1)