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7eb8a77ac8
When the store-appc-routes flag is on for a tailnet we are writing the routes more often than seems necessary. Investigation reveals that we are doing so ~every time we observe a dns response, even if this causes us not to advertise any new routes. So when we have no new routes, instead do not advertise routes. Fixes #12593 Signed-off-by: Fran Bull <fran@tailscale.com>