passing some tests on py3, all on py2

rowers/views/statements.py

@@ -726,7 +726,10 @@ def get_stored_tasks_status(request):
     taskstatus = []
     for id,func_name in reversed(taskids):
         progress = 0
-        cached_progress = cache.get(id)
+        try:
+            cached_progress = cache.get(id)
+        except ValueError:
+            cached_progress = 0
         finished = get_job_status(id)['finished']
         if finished:
             cache.set(id,100)