The setting wait_for_cache waits indefinitely even when there are no cache disks configured

The setting proxy.config.http.wait_for_cache allows to let traffic_server wait for the cache to initialize before processing requests (it basically blocks accepts). This is fine when cache is configured, but, if there are no disks configured in storage.config, this setting makes requests wait indefinitely. Ideally, the setting should consider cache initialized (disabled) when no disks are configured and just proxy the requests rather than block them forever.