fix 推送配置可能是空

src/SJZY.Track.Application.Contract/Services/ITrackPushCacheService.cs

@@ -19,7 +19,7 @@ public interface ITrackPushCacheService
     /// <param name="customId">服务商id</param>
     /// <param name="trackContentId"></param>
     /// <returns></returns>
-    Task<TrackPushContentConfigDto> GetPushContentConfigAsync(int subSystemId, int customId, int trackContentId);
+    Task<TrackPushContentConfigDto?> GetPushContentConfigAsync(int subSystemId, int customId, int trackContentId);
 
     /// <summary>
     /// 根据轨迹代码推断下一个（升序）要推送的内容，如果找不到或者已经是最后一个了，返回null

src/SJZY.Track.Application/EventHandlers/TrackUpsertEventHandler.cs

@@ -162,7 +162,7 @@ public class TrackUpsertEventHandler : ITransientDependency, ICapSubscribe
         {
             config = await _trackPushCacheService.GetPushContentConfigAsync(
                 @event.SubSystemId, @event.CustomId, track.TrackContentId);
-            if (!config.IsCanUpdate) return;
+            if (config == null || !config.IsCanUpdate) return;
         }
         else
         {