stamina: don't factor in some tolerance for earlier stop for streams

nonstop/management/commands/stamina.py

@@ -451,6 +451,9 @@ class Command(BaseCommand):
         # factor in some tolerance for diffusions a bit shorter than known, so
         # they are not replayed from the start if they finished too early.
         tolerance = datetime.timedelta(seconds=60)
+        if diffusion and hasattr(diffusion, 'is_stream') and diffusion.is_stream():
+            # unless it's a stream
+            tolerance = datetime.timedelta(seconds=0)
 
         # note it shouldn't be possible to have both diffusion and occurences
         # running at the moment.