neovim: handle plugins without pname

pkgs/applications/editors/neovim/tests/default.nix

@@ -247,6 +247,15 @@ pkgs.lib.recurseIntoAttrs rec {
       };
     };
 
+  nvim_with_no_pname_plugin = neovim.override {
+    extraName = "-with-no-pname-plugin";
+    configure.packages.plugins = {
+      start = [
+        vimPlugins.corePlugins
+      ];
+    };
+  };
+
   # regression test that ftplugin files from plugins are loaded before the ftplugin
   # files from $VIMRUNTIME
   run_nvim_with_ftplugin = runTest nvim_with_ftplugin ''
@@ -260,6 +269,10 @@ pkgs.lib.recurseIntoAttrs rec {
     [ "$result" = 0 ]
   '';
 
+  run_nvim_with_no_pname_plugin = runTest nvim_with_no_pname_plugin ''
+    ${nvim_with_no_pname_plugin}/bin/nvim -i NONE -e --headless +quit
+  '';
+
   # Generate a neovim wrapper with only a init.lua and no init.vim file
   nvim_with_only_init_lua = wrapNeovim2 "-only-lua-init-file" {
     luaRcContent = "-- some text";

pkgs/applications/editors/vim/plugins/utils/vim-utils.nix

@@ -218,7 +218,7 @@ let
             paths = allGrammars;
           };
 
-          allAndOptPluginNames = map (plugin: plugin.pname) (allPlugins ++ opt);
+          allAndOptPluginNames = map (plugin: plugin.pname or null) (allPlugins ++ opt);
 
           packdirStart = vimFarm "pack/${packageName}/start" "packdir-start" (
             if allGrammars != [ ] then allPlugins ++ [ allGrammarsSymlinked ] else allPlugins