make sure it does not try to dial on empty proto and write tests for it#52

daviddias merged 1 commit intomasterlibp2p/js-libp2p-switch:masterfrom

fix/warm-a-warm-up-the-other-way-aroundlibp2p/js-libp2p-switch:fix/warm-a-warm-up-the-other-way-aroundCopy head branch name to clipboard