now-rm: Don't show URL for incomplete deployments (#221)
now-rm: Don't show URL for incomplete deployments (#221)

Fixes this:

> The following deployment will be removed permanently:
XXXXXXXXXXXXXXXXXXXXXXXX      https://null      21d ago
zeit/now-cli,zeit/now-cli,southpolesteve/now-cli,zeit/now-cli,southpolesteve/now-cli,zeit/now-cli,mike-engel/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli