Modify Inline FormSet in Django Admin after validation and before save

admin.py

class InlineScreenshotFormSet(forms.models.BaseInlineFormSet):
    def clean(self):
        index = 0
        for error in self._errors:
            # If inline 'title' field is empty, fetch title from parent instead
            
            if 'title' in error:
                del self._errors[index]['title']
                self.forms[index].instance.title = self.data['title']
                self.forms[index].cleaned_data['title'] = self.data['title']
            index += 1

        return super(InlineScreenshotFormSet, self).clean()
        
class ScreenshotInline(admin.TabularInline):
    formset = InlineScreenshotFormSet