Add expansion transformer to eval graph

Add the expansion transformer to the eval graph,
which is used in rare scenarios which includes running
terraform console. Prevents panic when running terraform
console in contexts with module expansion

terraform/graph_builder_eval.go

@@ -89,6 +89,13 @@ func (b *EvalGraphBuilder) Steps() []GraphTransformer {
 		// analyze the configuration to find references.
 		&AttachSchemaTransformer{Schemas: b.Schemas, Config: b.Config},
 
+		// Create expansion nodes for all of the module calls. This must
+		// come after all other transformers that create nodes representing
+		// objects that can belong to modules.
+		&ModuleExpansionTransformer{
+			Config: b.Config,
+		},
+
 		// Connect so that the references are ready for targeting. We'll
 		// have to connect again later for providers and so on.
 		&ReferenceTransformer{},