'Request aborted' error sent to Sentry

[sentry]

We shouldn't report this error to Sentry

Sentry Issue: STUDIO-FMJ

Error: Request aborted: /api/sync/
  at None (/static/studio/channel_list-96b105a391f59bf1d576.js:1:985215)
  at withScope (/static/studio/channel_list-96b105a391f59bf1d576.js:1:977870)
  at withScope (/static/studio/channel_list-96b105a391f59bf1d576.js:1:984338)
  at None (/static/studio/channel_list-96b105a391f59bf1d576.js:1:985068)

[bjester]

Addressed in #3855