fix

rowers/session_utils.py

@@ -170,6 +170,7 @@ def is_session_complete_ws(ws, ps):
             completiondate = ws.reverse()[0].date
         return ratio, verdict, completiondate
 
+    return 0, 'not done', None
 
 def is_session_complete(r, ps):
     if r not in ps.rower.all():  # pragma: no cover