[Bug 290395] 15.0-BETA2: nuageinit crashes when no userdata is provided

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290395

            Bug ID: 290395
           Summary: 15.0-BETA2: nuageinit crashes when no userdata is
                    provided
           Product: Base System
           Version: 15.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: olgeni@FreeBSD.org

During the boot process, after network configuration and before starting
syslogd, nuageinit crashes with a Lua runtime error.

The error only occurs when no userdata is provided during VM deployment using
the 15.0-BETA2 image.

When userdata is provided (such as a shell script), nuageinit processes it
successfully without errors.

Nothing bad happens in case of error apparently, just the odd message on the
console.

Console log:

Starting dhclient.
DHCPDISCOVER on vtnet1 to 255.255.255.255 port 67 interval 8
DHCPOFFER from 169.254.169.253
DHCPREQUEST on vtnet1 to 255.255.255.255 port 67
DHCPACK from 169.254.169.253
bound to 10.114.0.7 -- renewal in 43200 seconds.
route: message indicates error: File exists
add host 127.0.0.1: gateway lo0 fib 0: route already in table
route: message indicates error: File exists
add host ::1: gateway lo0 fib 0: route already in table
add net fe80::: gateway ::1
add net ff02::: gateway ::1
add net ::ffff:0.0.0.0: gateway ::1
add net ::0.0.0.0: gateway ::1
Creating and/or trimming log files.
Clearing /tmp (X related).
Updating /var/run/os-release done.
Updating motd:.
/usr/libexec/flua: /usr/libexec/nuageinit:716: attempt to index a nil value
(loc
al 'line')
stack traceback:
        /usr/libexec/nuageinit:716: in main chunk
        [C]: in ?
Starting syslogd.

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