如果为空，则阻止django表单集提交

from django import forms
from django.http import HttpResponse

class MyForm(forms.Form):
    my_field = forms.CharField()

    def clean_my_field(self):
        data = self.cleaned_data['my_field']
        # 进行自定义的验证逻辑
        if data == "":
            raise forms.ValidationError("字段不能为空")
        return data

def my_view(request):
    if request.method == 'POST':
        form = MyForm(request.POST)
        if form.is_valid():
            # 表单验证通过，进行处理逻辑
            # ...
            return HttpResponse("表单提交成功")
    else:
        form = MyForm()
    return render(request, 'my_template.html', {'form': form})