maintainers/scripts/update.nix: handle null paths

Previously we did not handle non-existant paths making the program crash.
Let’s show a proper error.

1 files changed, 6 insertions, 3 deletions

diff --git a/maintainers/scripts/update.nix b/maintainers/scripts/update.nix
index 2d1f152ed770..b980514cc094 100755
--- a/maintainers/scripts/update.nix
+++ b/maintainers/scripts/update.nix
@@ -69,9 +69,12 @@ let
     let
       attrSet = pkgs.lib.attrByPath (pkgs.lib.splitString "." path) null pkgs;
     in
-      packagesWith (name: pkg: builtins.hasAttr "updateScript" pkg)
-                     (name: pkg: pkg)
-                     attrSet;
+      if attrSet == null then
+        builtins.throw "Attribute path `${path}` does not exists."
+      else
+        packagesWith (name: pkg: builtins.hasAttr "updateScript" pkg)
+                       (name: pkg: pkg)
+                       attrSet;
 
   packageByName = name:
     let