Make external_build field nullable
@@ -205,6 +205,8 @@ class Project(models.Model):
external_builds_enabled = models.BooleanField(
_('Build pull requests for this project'),
default=False,
+ # TODO: Remove this after migrations
+ null=True,
help_text=_('More information in <a href="https://docs.readthedocs.io/en/latest/guides/autobuild-docs-for-pull-requests.html">our docs</a>') # noqa
)
