fix: the issue when initialize SDK without global attribute (#11)

Co-authored-by: zhu-xiaowei <xiaoweii@amazom.com>

Author: zhu-xiaowei

example/lib/main.dart

@@ -58,6 +58,18 @@ class _MyAppState extends State<MyApp> {
     log("init SDK result is:$result");
   }
 
+  Future<void> initClickstreamWithoutGlobalAttribute() async {
+    bool result = await analytics.init(
+      appId: "shopping",
+      endpoint: testEndpoint,
+      isLogEvents: true,
+      isTrackScreenViewEvents: true,
+      isCompressEvents: false,
+      sessionTimeoutDuration: 30000,
+    );
+    log("init SDK result is:$result");
+  }
+
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
@@ -75,6 +87,14 @@ class _MyAppState extends State<MyApp> {
               },
               minLeadingWidth: 0,
             ),
+            ListTile(
+              leading: const Icon(Icons.not_started_sharp),
+              title: const Text('initSDKWithoutGlobalAttribute'),
+              onTap: () async {
+                initClickstreamWithoutGlobalAttribute();
+              },
+              minLeadingWidth: 0,
+            ),
             ListTile(
               leading: const Icon(Icons.circle),
               title: const Text('recordEventWithName'),

ios/Classes/ClickstreamFlutterPlugin.swift

@@ -56,8 +56,7 @@ public class ClickstreamFlutterPlugin: NSObject, FlutterPlugin {
                 .withSessionTimeoutDuration(arguments["sessionTimeoutDuration"] as! Int64)
                 .withCompressEvents(arguments["isCompressEvents"] as! Bool)
                 .withAuthCookie(arguments["authCookie"] as! String)
-            if arguments["globalAttributes"] != nil {
-                let attributes = arguments["globalAttributes"] as! [String: Any]
+            if let attributes = arguments["globalAttributes"] as? [String: Any] {
                 if attributes.count > 0 {
                     let globalAttributes = getClickstreamAttributes(attributes)
                     _ = configuration.withInitialGlobalAttributes(globalAttributes)