trouble panel fixes (empty diagnostics and todo)

lua/plugins.lua

@@ -19,6 +19,7 @@ vim.pack.add({
     { src = "https://codeberg.org/mfussenegger/nvim-dap.git" },
     { src = "https://github.com/echasnovski/mini.ai" },
     { src = "https://github.com/windwp/nvim-ts-autotag" },
+    { src = "https://github.com/nvim-lua/plenary.nvim" },
     { src = "https://github.com/folke/todo-comments.nvim" },
     { src = "https://github.com/stevearc/conform.nvim" },
     { src = "https://github.com/lewis6991/gitsigns.nvim" },
@@ -37,11 +38,15 @@ pcall(vim.cmd.colorscheme, "gruvbox")
 -- Simple setup({}) plugins
 for _, name in ipairs({
     "oil", "mini.pick", "mini.extra", "mini.icons", "mason", "typst-preview",
-    "nvim-autopairs", "trouble", "gitsigns", "mini.jump",
+    "nvim-autopairs", "gitsigns", "mini.jump",
     "mini.ai", "nvim-ts-autotag", "todo-comments", "csvview",
 }) do
     pcall(function() require(name).setup() end)
 end
+
+-- Open the Trouble window even when there are no results (e.g. no
+-- diagnostics) instead of erroring out with "No results".
+require("trouble").setup({ open_no_results = true })
 require("mini.icons").mock_nvim_web_devicons()
 
 -- Labeled jump-anywhere motion (flash replacement); trigger with <leader>j.