cmd: Fix defaulting admin address if empty in config, fixes reload
#4674
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Just a silly oops. Followup to #4443
I broke
caddy reload
when the admin address is not explicitly set in the config 😬 it would take the empty admin address if a--config
is specified at all, and never fall through to use the default.https://caddy.community/t/caddy-reload-failing/15556