fix: skip root module if undefined

Author: kamilmysliwiec

packages/core/injector/topology-tree/topology-tree.ts

@@ -23,7 +23,7 @@ export class TopologyTree {
   }
 
   private traverseAndMapToTree(node: TreeNode<Module>, depth = 1) {
-    if (!node.value?.imports) {
+    if (!node.value.imports) {
       return;
     }
     node.value.imports.forEach(child => {

packages/core/scanner.ts

@@ -401,6 +401,9 @@ export class DependenciesScanner {
     modulesGenerator.next();
 
     const rootModule = modulesGenerator.next().value!;
+    if (!rootModule) {
+      return;
+    }
 
     // Convert modules to an acyclic connected graph
     const tree = new TopologyTree(rootModule);