使用python版本3.8.1

from django.shortcuts import render

from .models import Topic

from django.http import HttpResponseRedirect

from django.urls import reverse

from .forms import TopicForm

def new_topic(request):

    if request.method!='POST':

        form=TopicForm()

    else:

        form=TopicForm(request.POST)

        if form.is_valid():

            form.save()

            return HttpResponseRedirect(reverse('learning_logs:topics'))

        context={'form':form}

        return render(request,'learning_logs/new_topic.html',context)

始终显示

ValueError at /new_topic/

The view learning_logs.views.new_topic didn't return an HttpResponse object. It returned None instead.