Naming the subgraph should be optional

[KevinMarquette]

If you never reference a subgraph by name, do you even need to name it?

This is how it should look.

graph {
    subgraph {
        node A
    }
    node B
    Edge A -To B
}

[larssb]

This works. However, if one defines a attributes hashtable on the subgraph like SubGraph @{style='filled';color='lightgrey'} -ScriptBlock { ... }. Without using the -Attributes parameter PSGraph fails with

Error: <stdin>: syntax error in line 4 near '.'
Export-PSGraph : System error.
At /gitRepos/PowerShellTooling/Public/PowerShellInfo/Out-PSModuleCallGraph.ps1:473 char:22
+         $graphData | Export-PSGraph -ShowGraph
+                      ~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo          : NotSpecified: (:) [Write-Error], ParseException
+ FullyQualifiedErrorId : System.Management.Automation.ParseException,Export-PSGraph

I guess its okay, but could maybe be improved. I would think that this happens because of parameter location awareness. If one cannot avoid using -Attributes the error message could be improved I think.

Thank you very much.