[libvirt] [sandbox]console-rpc: fix segfault on null stdin

[Radu Caragea]

If gvir_sandbox_console_attach is called with NULL as the stdin
parameter it results in a segfault in the console-rpc module from
libvirt-sandbox.
Calling with NULL is of course useful when running something
noninteractive and you don't want it to grab the stdin or pass any fd
whatsoever.
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