Looks like Xcode isn't generating any UIDeviceRequiredCapabilities
for watchOS 1 extensions.
It used to have UIRequiredDeviceCapabilities = 'watch-companion'
but that *might* not be required anymore.
Commit 94e35a8570 on xamarin-macios/master
comes from those same assumptions.
Now regarding bug #41204:
User is getting error "ERROR ITMS-90563: "Missing UIRequiredDeviceCapabilities value"
when publish WatchKitCatalog sample.
(https://bugzilla.xamarin.com/show_bug.cgi?id=41204)
This might happen because we're still creating an empty array for the
UIDeviceRequiredCapabilities key.
In any case there's no need to create it.
6ca327e193