title: How to allow empty form field in django
body: <p>I am currently having trouble with the one I am working on. I would like to allow empty uuid field save to database.</p>
  
  <p>this is my code</p>
  
  <p>models.py</p>
  
  <pre><code>mission_id = models.UUIDField(null=True, blank=True)
  </code></pre>
  
  <p>forms.py</p>
  
  <pre><code>class SomeForm(ModelForm):    
      class Meta:    
          model = SomeModel
          widgets = {
              'mission_id': TextInput(),
          }
  </code></pre>
  
  <p>but I got an error message</p>
  
  <pre><code>Enter a valid UUID.
  </code></pre>