title: Django fail to raise an error when a minimum length password is required
body: <p>I have an form that allows a user to create a user account. I also enforce a minimum password length of 8 and when that is breached , An error would be raise . The problem is , it doesn't raise an error whenever the minimum password length of 8 is breached . </p>
  
  <p>Can someone kindly help me.</p>
  
  <pre><code>def Registration(request):  
      form = UserRegistration()
      if request.method =='POST':
          form = UserRegistration(request.POST)
          if form.is_valid():
              user = User.objects.create_user(
                  username=form.cleaned_data['username'], 
                  email=form.cleaned_data['email'], 
                  password=form.cleaned_data['password']
                  )
              user.is_active = True
              user.save()
               return render(request,'choose.html',{'form':form})
  
      return render(request, 'register.html', {'form': form},)
  </code></pre>
  
  <p>my forms.py</p>
  
  <pre><code> class UserRegistration(forms.Form):
      username = forms.CharField()
      email = forms.EmailField(error_messages={'required':'Error Missing Field , Please Fill this Field'})
  
      password = forms.CharField(
      widget=forms.PasswordInput(render_value=False)
      )
  
      MIN_LENGTH = 8
  
      def clean_password(self):
              password = self.cleaned_data['password']
  
              if len(password) &gt; self.MIN_LENGTH:
                      raise forms.ValidationError("The new password must be at least %d characters long." % self.MIN_LENGTH)
  
              return password
  </code></pre>
  
  <p>My template</p>
  
  <pre><code>&lt;form method ="POST"&gt;
      {% csrf_token %}
  
  
  &lt;span id="error"&gt;{{form.username.errors}}&lt;/span&gt;
  &lt;span id="error2"&gt;{{form.email.errors}}&lt;/span&gt;
  &lt;span id="error3"&gt;{{form.password.errors}}&lt;/span&gt;
  
  {{form.username}}
  {{form.email}}
  {{form.password}}
      &lt;input type = "submit" value= "save" id="box2"/&gt;
  &lt;/form&gt;
  </code></pre>