修复前端：优化演示免验证码与凭据空值兼容性

build_ui/src/views/login.vue

@@ -121,9 +121,9 @@ export default {
       const password = localStorage.getItem('password')
       const rememberMe = localStorage.getItem('rememberMe')
       this.loginForm = {
-        username: username === undefined ? this.loginForm.username : username,
-        password: password === undefined ? this.loginForm.password : decrypt(password),
-        rememberMe: rememberMe === undefined ? false : Boolean(rememberMe),
+        username: (username !== null && username !== undefined && username !== '') ? username : '',
+        password: (password !== null && password !== undefined && password !== '') ? (decrypt(password) || '') : '',
+        rememberMe: (rememberMe !== null && rememberMe !== undefined) ? Boolean(rememberMe) : false,
         code: '',
         uuid: this.loginForm.uuid || ''
       }