diff --git a/lib/default.nix b/lib/default.nix
index 14e6e27a3..5a948bbf3 100644
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -49,6 +49,8 @@ let
 
     indent = replaceChars ["\n"] ["\n  "];
 
+    stripAttr = converge (filterAttrsRecursive (n: v: v != {} && v != null));
+
     mapNixDir = f: x: {
       list = foldl' mergeAttrs {} (map (mapNixDir1 f) x);
       path = mapNixDir1 f x;