Fix for swift 5.1 compiler warning when type is an enum with a none case

[cltnschlosser]

Resolves apollographql/apollo-ios#724

cc @designatednerd

[designatednerd]

This looks good in theory but I want to test this against our existing codebase before I merge. I'm out moving until 3 September so it'll probably be around then, just FYI

[cltnschlosser]

Yep, no problem. I saw that you were out, just thought I’d throw up the pull request anyway :)

[cltnschlosser]

@designatednerd Have you had a chance to look at this?

[designatednerd]

This will need some slight tweaks in light of #1515, which was just merged. Could you also add a line to the CHANGELOG for this as well?

[cltnschlosser]

@designatednerd Updated it, but any advice on those CI failures. Seem to be completely unrelated.

[designatednerd]

Those tests are super tempermental, I kicked both builds

[designatednerd]

@cltnschlosser Mind pushing a dummy commit? Looks like our CI may have temporarily lost its mind and needs a kick at the push level.

[cltnschlosser]

I pushed an empty file and that build passed, then I dropped that commit and the build failed :(

[designatednerd]

:lolsob:

Kicking the builds again to see if it's a transient failure - it's possible dropping the commit might have kicked things back to an old build where things got screwed up though.

[designatednerd]

Yyyyyup. Looks like it needs another commit. I found a dumb thing it'd be nice to actually include so it doesn't have to be a total-dummy commit.

[designatednerd]

🎉it worked! 🎉Now lemme test the branch against the SDK to figure out whether this needs to go as a patch or a minor - I suspect a patch but worth double checking...

[designatednerd]

Patch it is! Merging