Make sure we're only adding to the top-level group

Motivation: other groups may have an undefined "name" property other than the top level

Fix #226

onesignal/withOneSignalIos.ts

@@ -166,7 +166,7 @@ const withOneSignalXcodeProject: ConfigPlugin<OneSignalPluginProps> = (config, p
     // files / folder appear in the file explorer in Xcode.
     const groups = xcodeProject.hash.project.objects["PBXGroup"];
     Object.keys(groups).forEach(function(key) {
-      if (groups[key].name === undefined) {
+      if (typeof groups[key] === "object" && groups[key].name === undefined && groups[key].path === undefined) {
         xcodeProject.addToPbxGroup(extGroup.uuid, key);
       }
     });