视图courses.views.checkout.verifypayment未返回HttpResponse对象。它返回None

from django.http import HttpResponse

def verifypayment(request):
    if request.method == 'POST':
        # 处理支付验证逻辑
        if payment_is_valid:
            return HttpResponse("Payment verified")
        else:
            return HttpResponse("Payment failed", status=400)
    # 这里缺少返回值

from django.http import HttpResponse

def verifypayment(request):
    if request.method == 'POST':
        try:
            # 处理支付验证逻辑
            if payment_is_valid:
                return HttpResponse("Payment verified")
            else:
                return HttpResponse("Payment failed", status=400)
        except Exception as e:
            # 捕获异常并返回错误信息
            return HttpResponse(f"An error occurred: {str(e)}", status=500)
    else:
        # 确保所有分支都有返回值
        return HttpResponse("Method not allowed", status=405)