show all virtual races if no upcoming

rowers/views/racesviews.py

@@ -465,6 +465,9 @@ def virtualevents_view(request):
 
     races = (races1 | races2).order_by("startdate","start_time")
 
+    if len(races) == 0:
+        races = VirtualRace.objects.all()
+
     if not request.user.is_anonymous:
         r = getrower(request.user)
     else: