Adding a non-existant dep results in uncontrolled panic WHEN calling Analyze/Run

[Itxaka]

package main

import (
	"github.com/spectrocloud-labs/herd"
)

func main() {
	g := herd.DAG()
	g.Add("one", herd.WithDeps("broken"))
	g.Analyze() // or g.Run(context.Background())
}

Results in:

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x466fb4]

goroutine 1 [running]:
github.com/spectrocloud-labs/herd.(*Graph).buildStateGraph(0xc00010e210)
        /home/itxaka/go/pkg/mod/github.com/spectrocloud-labs/[email protected]/dag.go:85 +0x214
github.com/spectrocloud-labs/herd.(*Graph).Analyze(...)
        /home/itxaka/go/pkg/mod/github.com/spectrocloud-labs/[email protected]/dag.go:98
main.main()
        /home/itxaka/projects/immucore/test/main.go:10 +0x91

Why I understand why this is, maybe its possible to catch, log and exit with Fatal claiming that some deps are non-existant.