extensions/views/manage.py

@@ -361,8 +361,9 @@ class DraftExtensionView(
     def get_initial(self):
         """Return initial values for the version, based on the file."""
         initial = super().get_initial()
-        initial['file'] = self.version.file
-        initial.update(**self.version.file.parsed_version_fields)
+        if self.version:
+            initial['file'] = self.version.file
+            initial.update(**self.version.file.parsed_version_fields)
         return initial
 
     def get_context_data(self, form=None, extension_form=None, add_preview_formset=None, **kwargs):

extensions/views/mixins.py

@@ -1,6 +1,5 @@
 from django.contrib.auth.mixins import UserPassesTestMixin
 from django.shortcuts import get_object_or_404, redirect
-from django.core.exceptions import BadRequest
 
 from extensions.models import Extension
 from files.models import File
@@ -60,9 +59,6 @@ class DraftVersionMixin:
 
     def dispatch(self, *args, **kwargs):
         self.version = self.extension.versions.first()
-        if self.version is None:
-            error_message = f'Extension "{self.extension.name}" has no versions.'
-            raise BadRequest(error_message)
         return super().dispatch(*args, **kwargs)