Don't generate releaseGroup create edits for existing releases
Give time for validation before getting new previews
Store submitted relationship data in sessionStorage
Remove unnecessary try/catch
Merge remote-tracking branch 'bitmap/some-recent-ises' into beta

* bitmap/some-recent-ises:
  Remove unnecessary try/catch
  Store submitted relationship data in sessionStorage
  Give time for validation before getting new previews
  Don't generate releaseGroup create edits for existing releases