user-tie replaced with user-chart for Self Coach

rowers/views.py

@@ -17091,9 +17091,11 @@ def planmesocyclebyweek(request,id=0,userid=0):
     #we're still here. We have permission
     sundays = [s for s in allsundays(cycle.startdate,cycle.enddate)]
 
-    if sundays[-1] < cycle.enddate:
+    if sundays and sundays[-1] < cycle.enddate:
         sundays = sundays+[cycle.enddate]
-    
+    else:
+        sundays = [cycle.enddate]
+        
     for i in range(len(sundays)):
         if i==0:
             monday = cycle.startdate