Percy Wegmann 74b9fa1348 ipn/localapi: only flush relevant data in multiFilePostResponseWriter.Flush()
This prevents two things:

1. Crashing if there's no response body
2. Sending a nonsensical 0 response status code

Updates tailscale/corp#22357

Signed-off-by: Percy Wegmann <percy@tailscale.com>
2024-08-14 12:28:40 -05:00
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