fix: check for nil and empty string

empty string is not falsy in lua? idk

lua/codemp/client.lua

@@ -3,13 +3,14 @@ local workspace = require("codemp.workspace")
 local function connect()
 	---@type Config
 	local tmp_cfg = vim.tbl_extend('force', {}, CODEMP.config)
-	if not tmp_cfg.username then
+	if tmp_cfg.username == nil or #tmp_cfg.username == 0 then
 		tmp_cfg.username = vim.g.codemp_username or vim.fn.input("username > ", "")
 	end
-	if not tmp_cfg.password then
+	if tmp_cfg.password == nil or #tmp_cfg.password == 0 then
 		tmp_cfg.password = vim.g.codemp_password or vim.fn.input("password > ", "")
 	end
 	CODEMP.native.connect(tmp_cfg):and_then(function (client)
+		print(" ++ connected")
 		CODEMP.client = client
 		require('codemp.window').update()
 		workspace.list()

lua/codemp/command.lua

@@ -25,7 +25,6 @@ local base_actions = {
 
 	connect = function()
 		client.connect()
-		print(" ++ connected")
 	end,
 }