Fran Bull 7eb8a77ac8 appc: don't schedule advertisement of 0 routes
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>
2024-06-25 08:12:51 -07:00
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