Open-event-frontend: Modify side bar to hide tabs for missing data

[dilpreetsio]

I'm submitting a ... (check one with "x")

• [x] bug report
• [ ] feature request
• [ ] support request => Please do not submit support requests here, instead ask your query in out Gitter channel at https://gitter.im/fossasia/open-event-frontend

Current behavior:

Expected behavior:
The tabs should be hidden if the data is not present.

[CosmicCoder96]

@geekyd @sumedh123 Isn't this a duplicate of https://github.com/fossasia/open-event-frontend/issues/589 ?

[dilpreetsio]

@CosmicCoder96 No, for the above event, sessionspeaker is enabled but there is no speaker data, also the ticket is enabled but there is no ticked data present.

[lunaticmonk]

@geekyd Can you elaborate what is needed in this issue? Because if we check by doing:

event.speakers

or other things like this, we ll end up making request to speakers. I tried to do that in my PR for #589 but niranjan told me to remove that. Please correct me if I am wrong and explain what is required here?

[dilpreetsio]

We need a better way to handle this one option is to make all requests in the public route only. That way we wont be making duplicate requests.