fixing zip - without uploadoptions

rowers/dataprep.py

@@ -1470,7 +1470,7 @@ def new_workout_from_file(r, f2,
                           boattype='1x',
                           makeprivate=False,
                           notes=''):
-    message = None
+    message = ""
     impeller = False
     try:
         fileformat = get_file_type(f2)
@@ -1495,6 +1495,7 @@ def new_workout_from_file(r, f2,
         f3 = f3[6:]
         a = MessageAttachment(message=msg,document=f3)
         a.save()
+        message = "Zip file was stored for offline processing"
 
         return -1, message, f2