backend: don't even try to connect if port == "0" #5209
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This is really annoying me! On my windows box with WSL, it tries to connect to
bogus:0and has slow resolution failures for every JMAP test because JMAP will connect to the smtp server in order to fetch capabilities.This patch just checks for port == "0" which is always bogus, and returns before calling out to
getaddrinfoso it doesn't wait.