修复显示合计

src/Hotline.Api/Controllers/Snapshot/BiSnapshotController.cs

@@ -108,11 +108,14 @@ public class BiSnapshotController : BaseController
     public async Task<IList<HotspotDataStatisticsOutDto>> GetHotspotDataStatisticsAsync([FromQuery] HotspotDataStatisticsInDto dto)
     {
         var items = await _biSnapshotApplication.GetHotspotDataStatisticsAsync(dto).ToListAsync();
-        items.Add(new HotspotDataStatisticsOutDto
+        if (items.Count != 0)
         {
-            Name = "合计",
-            OrderCount = items.Sum(x => x.OrderCount),
-        });
+            items.Add(new HotspotDataStatisticsOutDto
+            {
+                Name = "合计",
+                OrderCount = items.Sum(x => x.OrderCount),
+            });
+        }
         return items;
     }