vscclient: do not add a socket watch if there is not data to send
Fixes the following error: ** (process:780): CRITICAL **: do_socket_send: assertion `socket_to_send->len != 0' failed Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com> Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
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