Concurrent calls to AddVertex, AddEdge, and AdjacencyMap redundantly panic.
panic: assignment to entry in nil map
goroutine 1996 [running]:
github.com/dominikbraun/graph.(*undirected[...]).AdjacencyMap(0xc0009542c0?)
github.com/dominikbraun/graph@v0.16.2/undirected.go:167 +0x225
ListVertices and ListEdges directly occur AddVertex and AddEdge will cause this problem
Concurrent calls to AddVertex, AddEdge, and AdjacencyMap redundantly panic.
ListVertices and ListEdges directly occur AddVertex and AddEdge will cause this problem