yt-dlp: generate config if settings or extraConfig are defined (#4018)

Previously, the config was generated only if settings were defined. In a
case where settings weren't defined, extraConfig was ignored.

modules/programs/yt-dlp.nix

@@ -66,9 +66,11 @@ in {
   config = mkIf cfg.enable {
     home.packages = [ cfg.package ];
 
-    xdg.configFile."yt-dlp/config" = mkIf (cfg.settings != { }) {
+    xdg.configFile."yt-dlp/config" =
+      mkIf (cfg.settings != { } || cfg.extraConfig != "") {
         text = concatStringsSep "\n"
-        (remove "" (renderSettings cfg.settings ++ [ cfg.extraConfig ])) + "\n";
+          (remove "" (renderSettings cfg.settings ++ [ cfg.extraConfig ]))
+          + "\n";
       };
   };
 }

tests/modules/programs/yt-dlp/default.nix

@@ -1 +1,4 @@
-{ yt-dlp-simple-config = ./yt-dlp-simple-config.nix; }
+{
+  yt-dlp-simple-config = ./yt-dlp-simple-config.nix;
+  yt-dlp-extraConfig = ./yt-dlp-extraConfig.nix;
+}

tests/modules/programs/yt-dlp/yt-dlp-extraConfig-expected

@@ -0,0 +1,2 @@
+--config-locations /home/user/.yt-dlp.conf
+

tests/modules/programs/yt-dlp/yt-dlp-extraConfig.nix

@@ -0,0 +1,19 @@
+{ ... }:
+
+{
+  programs.yt-dlp = {
+    enable = true;
+    extraConfig = ''
+      --config-locations /home/user/.yt-dlp.conf
+    '';
+  };
+
+  test.stubs.yt-dlp = { };
+
+  nmt.script = ''
+    assertFileExists home-files/.config/yt-dlp/config
+    assertFileContent home-files/.config/yt-dlp/config ${
+      ./yt-dlp-extraConfig-expected
+    }
+  '';
+}