"Add user" and "Add teacher" should not appear until after a facility exists

[bcipolli]

Suggestion:

• Have "Add Facility", hide "add user" and "add teacher"
• Efficient from securesync/api_views:status to check if Facility.objects.count() > 0

[wangguan59]

Jamie said this might be little tricky because it would be interact with cache. The top nav bar is under base_distributed.html . If I modify that, it would check every time the page loads, which is not very efficient. Do you have any suggestions?

[bcipolli]

I don't see any problem; the navbar is controlled through AJAX requests already, to have good performance. No interaction with caching.

My suggestion is in the body of the pull request; in the code to get navbar information through the API, have a flag for facility_exists, that checks if Facility.objects.count() > 0. From the client-side, use that flag appropriately.

Nothing conceptually different than what's already done in the navbar.

[bcipolli]

@wangguan59 note the milestone: this is not targeted for KA Lite 0.10, so no rush to implement.