test(extras): handle plugins using url instead of short format

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/extras/extra_spec.lua

@@ -77,11 +77,13 @@ describe("Extra", function()
       it("it has no renamed plugins", function()
         for _, p in pairs(spec.plugins) do
           local short_url = p[1]
+          if short_url then
             assert(
               not LazyVim.plugin.renames[short_url],
               "Plugin " .. short_url .. " has been renamed to " .. (LazyVim.plugin.renames[short_url] or "")
             )
           end
+        end
       end)
 
       local lspconfig = spec.plugins["nvim-lspconfig"]