## Bug description

This is what a default feature flag looks like:
<img width="577" alt="empty feature flag" src="https://user-images.githubusercontent.com/4550621/113333154-63f36a00-9322-11eb-8fb0-71b0cd865181.png">
It has no rollout percentage specified, nor filters, so it says "Rolling out to 100% of users". However I've experienced that in fact in this situation the flag is rolled out to *nobody*.

CC @paolodamico 

## Expected behavior

Flag should work the way it says.

## How to reproduce

1. Create a feature flag and leave it as is, supposedly completely rolled out.
2. Try to use it.
3. Discover that the flag is not rolled out.

## Environment

- [x] PostHog Cloud
- [x] self-hosted PostHog, version/commit: master (8f4ae2b)

#### *Thank you* for your bug report – we love squashing them!

posthog/api/test/test_decide.py
return base64.b64encode(json.dumps(data).encode("utf-8")).decode("utf-8")
    def _post_decide(self, data=None, origin="http://127.0.0.1:8000"):
        return self.client.post(
            "/decide/",
            {"data": self._dict_to_b64(data or {"token": self.team.api_token, "distinct_id": "example_id"})},
            HTTP_ORIGIN=origin,
        )
    def test_user_on_own_site_enabled(self):
        user = self.organization.members.first()
        user.toolbar_mode = "toolbar"
        user.save()
        self.team.app_urls = ["https://example.com/maybesubdomain"]
        self.team.save()
        response = self.client.get("/decide/", HTTP_ORIGIN="https://example.com").json()
        self.assertEqual(response["isAuthenticated"], True)
        self.assertEqual(response["supportedCompression"], ["gzip", "gzip-js", "lz64"])
        self.assertEqual(response["editorParams"]["toolbarVersion"], "toolbar")
    def test_user_on_own_site_disabled(self):
        user = self.organization.members.first()
        user.toolbar_mode = "disabled"
        user.save()
        self.team.app_urls = ["https://example.com/maybesubdomain"]
        self.team.save()
        
        response = self.client.get("/decide", HTTP_ORIGIN="https://example.com").json()
        self.assertEqual(response["isAuthenticated"], True)
        self.assertIsNone(response.get("toolbarVersion", None))
    def test_user_on_evil_site(self):