Merge branch 'release' into 'master'

Release

See merge request !360

src/main/java/com/zhiwei/brandkbs2/controller/app/AppHotController.java

@@ -416,15 +416,17 @@ public class AppHotController extends BaseController {
         List<JSONObject> lastList = source.stream().filter(json -> json.getLong("startTime") >= (timeRange[0] - space) && json.getLong("startTime") < timeRange[0]).collect(Collectors.toList());
         result.put("currentCount", list.size());
         result.put("lastCount", list.size() - lastList.size());
-        Map<String, List<JSONObject>> platformMap = list.stream().collect(Collectors.groupingBy(json -> HotPlatformEnum.convertPlatform(json.getString("type"))));
-        List<JSONObject> platformCount = new ArrayList<>();
-        platformMap.forEach((platform, datas) -> {
-            JSONObject json = new JSONObject();
-            json.put("platform", platform);
-            json.put("count", datas.size());
-            platformCount.add(json);
-        });
-        result.put("platformCount", platformCount);
+        if (!list.isEmpty()) {
+            Map<String, List<JSONObject>> platformMap = list.stream().collect(Collectors.groupingBy(json -> HotPlatformEnum.convertPlatform(json.getString("type"))));
+            List<JSONObject> platformCount = new ArrayList<>();
+            platformMap.forEach((platform, datas) -> {
+                JSONObject json = new JSONObject();
+                json.put("platform", platform);
+                json.put("count", datas.size());
+                platformCount.add(json);
+            });
+            result.put("platformCount", platformCount);
+        }
         result.put("averageCount", source.size() / (Constant.ONE_YEAR / space));
         return result;
     }