Fix RemoteChannel iterator interface

[danielwe]

Just a missing import

[danielwe]

CI seems to be running new tests with old code

[LilithHafner]

Strange. The source diff LGTM, and I can confirm locally that it fixes an undefined value error.

I don't know what is going on with the tests and am not familiar with the testing infrastructure of this repo.

[fatteneder]

The rebase fixed the tests. I also checked locally that the problem is fixed. So I go ahead and merge this.