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nixos/mpd: correctly handle null valued cfg.settings
Tested with:
```diff
diff --git a/nixos/tests/mpd.nix b/nixos/tests/mpd.nix
index 36337bfbb4de..980dcca9048d 100644
--- a/nixos/tests/mpd.nix
+++ b/nixos/tests/mpd.nix
@@ -63,6 +63,7 @@ in
mpd = defaultMpdCfg // {
settings = {
bind_to_address = "any";
+ db_file = null;
audio_output = [
{
type = "alsa";
```
Per https://github.com/NixOS/nixpkgs/pull/485884#issuecomment-3865647552