fix:去除使用OSSHelper时去除掉OssKey为空的调用，修复空字符串异常

src/SJZY.Track.Application/Services/TrackContents/TrackContentService.cs

@@ -261,12 +261,20 @@ public class TrackContentService : ApplicationService
             Data = ObjectMapper.Map<TrackDetailsIndex, GetContentDetailOutput>(content)
         };
 
-
-        if (res.Data != default && res.Data.Files.Any())
+        if (res.Data != null && res.Data.Files?.Count > 0)
         {
+            var ossKeys = res.Data.Files
+                .Where(x => !string.IsNullOrWhiteSpace(x.OssKey))
+                .Select(x => x.OssKey)
+                .ToArray();
+
+            if (ossKeys.Length == 0) return res;
+
+            var ossKeyUrlDict = OSSHelper.GetUrlByKeys(ossKeys);
             foreach (var item in res.Data.Files)
             {
-                item.Url = OSSHelper.GetUrlByKey(item.OssKey);
+                if (string.IsNullOrWhiteSpace(item.OssKey)) continue;
+                item.Url = ossKeyUrlDict.GetValueOrDefault(item.OssKey)!;
             }
         }
 
@@ -305,6 +313,7 @@ public class TrackContentService : ApplicationService
         {
             trackDetails = trackDetails.Where(m => m.Source != (int) TrackSourceEnum.ExternalServiceProvide).ToList();
         }
+
         //进行推送时，匹配订单类型一致的轨迹
         if (input.TrackOptionType == TrackOptionType.推送)
         {