Django Allauth：注册表单中的可选字段

我正在使用Django Allauth设置，在我的注册/注册表单中有其他字段。对于必填字段，一切正常，但当我尝试向注册表中添加一些可选字段时，问题就开始了

My settings.py：

ACCOUNT_SIGNUP_FORM_CLASS = 'myapp.forms.RegistrationForm'

forms.py：

class RegistrationForm(forms.ModelForm):

    category = forms.ChoiceField(choices=CATEGORY_CHOICES)
    password1 = forms.CharField(widget=forms.PasswordInput(), label="Password")
    password2 = forms.CharField(widget=forms.PasswordInput(),
                            label="Password (again)"
                            )
    company = forms.CharField()

    ....
    class Meta:
       model = User
       fields = ('email', 'first_name', 'last_name', )

    def signup(self, request, user):
          category =  self.cleaned_data['category']
          company = self.cleaned_data['company']
          person = UserProfile(user=user, category=category, )
                         company=company,)
          person.save()

models.py：

class UserProfile(models.Model):
...
    user = models.OneToOneField(User, related_name='profile',
                            verbose_name=_('user'))
    company = models.CharField(max_length=100, blank=True, null=True,
                           verbose_name=_('company'))
User.profile = property(lambda u:     UserProfile.objects.get_or_create(user=u)[0]

因此，category字段是必需的，并且是可以的。但是我怎么能把company字段作为可选字段呢

company = forms.CharField(required=False)

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