Bug 1061411 - [Contacts] ICE 1 & ICE 2 can be set to the same contact r=jmcf

Yes we are handling it, but not in this specific case.

That's the magic about promises, since we are calling this promises chain (it will be a chain), and handling the promise returned here:
https://github.com/mozilla-b2g/gaia/pull/24169#discussion-diff-17721121R148