Ignore None values early when initializing MonadicDict.

* wqflask/utility/monads.py (MonadicDict.__init__): Ignore None values
early instead of converting them to Nothing and then ignoring them.

1 files changed, 2 insertions, 2 deletions

diff --git a/wqflask/utility/monads.py b/wqflask/utility/monads.py
index 80ba42c8..e42a60f2 100644
--- a/wqflask/utility/monads.py
+++ b/wqflask/utility/monads.py
@@ -74,8 +74,8 @@ class MonadicDict(UserDict):
         converted to monadic values.
         """
         if convert:
-            super().__init__({key:(Nothing if value is None else Just(value))
-                              for key, value in d.items()})
+            super().__init__({key:Just(value) for key, value in d.items()
+                              if value is not None})
         else:
             super().__init__(d)
     def __getitem__(self, key):