If I disable guest-network-get-interfaces RPC in VM's qemu-guest-agent by adding it to blocked RPCs:

```
/usr/bin/qemu-ga --method=virtio-serial --path=/dev/virtio-ports/org.qemu.guest_agent.0 -F/etc/qemu-ga/fsfreeze-hook --block-rpcs=guest-network-get-interfaces
```

I can observe:
```
{"component":"virt-launcher","level":"error","msg":"Fetching guest info failed: virError(Code=1, Domain=10, Message='internal error: unable to execute QEMU agent command 'guest-network-get-interfaces': Command guest-network-get-interfaces has been disabled: the command is not allowed')","pos":"agent_poller.go:418","timestamp":"2025-12-16T13:25:06.672514Z"}
```

and no other information from the VM are being propagated.

Instead I'd like to see in such case that virt-launcher collect any other information that is available and simply skip whatever isn't exposed by the guest agent.

Tested on Fedora 43 guest OS and OS-V 4.20.1 

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