At the moment, if you attempt to set your package index, but cannot reach the package index, that error is fatal. While we should warn the user by default in this case, we should not force the program to exit.
<rdar://problem/67410416>
Created attachment 406850 [details] Patch
Created attachment 406860 [details] Patch
Committed r265885: <https://trac.webkit.org/changeset/265885> All reviewed patches have been landed. Closing bug and clearing flags on attachment 406860 [details].