Export during fetch creates nav loop

Had this happen to me earlier today.
1) Navigated to a past broadcast details page for the first time
2) clicked export to YouTube, while track third-party data was being fetched in the background
3) browser opened to YouTube URL with no video ID string (no youtube IDs had yet been inserted for this playlist's tracks)
4) attempted to back-nav

Upon back-nav to KDVS App, another intent was launched for YouTube; further back-navs resulted in the same loop.

Ensure that the export intent only occurs after all fetches for the playlist have finished. This is important especially for YouTube since we must build a single URL from all IDs, whereas Spotify playlist adding can be done piecemeal.