上传导航错误修复

lib/modules/agent/views/message_bubble.dart

@@ -291,9 +291,10 @@ class MessageBubble extends GetView<AgentController> {
         // 旅游
         return buildTravelContent(context, travellist);
       } else if (meta!.keys.contains('maps_route_navigation')) {
-        final card_navigation = meta!['maps_route_navigation']
-            ['card_navigation'] as Map<String, dynamic>?;
-        if (card_navigation != null) {
+        final maps_route_navigation = meta!['maps_route_navigation'];
+        if (maps_route_navigation is Map<String, dynamic>) {
+          final card_navigation =
+              maps_route_navigation["card_navigation"] as Map<String, dynamic>;
           final start = card_navigation['start'] as String? ?? '';
           final end = card_navigation['end'] as String? ?? '';
           final destination = card_navigation['destination'] as String? ?? '';
@@ -316,9 +317,8 @@ class MessageBubble extends GetView<AgentController> {
         }
       } else if (meta!.keys.contains('maps_google_route_navigation')) {
         final maps_google_route_navigation =
-            meta!['maps_google_route_navigation'] as Map<String, dynamic> ??
-                null;
-        if (maps_google_route_navigation != null) {
+            meta!['maps_google_route_navigation'];
+        if (maps_google_route_navigation is Map<String, dynamic>) {
           final data = maps_google_route_navigation['data'];
           if (data != null) {
             final origin = data['origin'] as String? ?? '';