[Patch] Dtwitter crash if user not logged

打开 dwitter-part-4/source_code_final/dwitter/views.py，检查 dashboard view 中 request.user.profile 访问附近的代码。重现未经过身份验证的浏览器请求，然后验证它会重定向到管理员登录页面，而不是引发 AnonymousUser 异常。

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Describe the bug
If you get from part-4 the source final and load in the browser you get:

Traceback (most recent call last):
  File "/var/www/dtwitter/myvenv/lib/python3.11/site-packages/django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
               ^^^^^^^^^^^^^^^^^^^^^
  File "/var/www/dtwitter/myvenv/lib/python3.11/site-packages/django/core/handlers/base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/var/www/dtwitter/dwitter/views.py", line 17, in dashboard
    user__profile__in=request.user.profile.follows.all()
                      ^^^^^^^^^^^^^^^^^^^^
  File "/var/www/dtwitter/myvenv/lib/python3.11/site-packages/django/utils/functional.py", line 247, in inner
    return func(self._wrapped, *args)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'AnonymousUser' object has no attribute 'profile'

Fix

The first lines of the file https://github.com/realpython/materials/blob/master/dwitter-part-4/source_code_final/dwitter/views.py#L7 should be:

from django.shortcuts import render, redirect
from django.contrib.auth.decorators import login_required

from .forms import DweetForm
from .models import Dweet, Profile

@login_required(login_url='/admin/')
def dashboard(request):
    form = DweetForm(request.POST or None)

In this way automatically if the user is not logged get redirect to the admin for login, maybe there are better ways as it is just a prototype, but a prototype shouldn't crash.