Merge remote-tracking branch 'origin/dev-1.2' into dev

kernel/src/main/java/com/lantone/qc/kernel/structure/ai/ModelAI.java

@@ -251,7 +251,7 @@ public class ModelAI {
      */
     public JSONArray getChiefPresentSimilarOutputs(JSONArray predY) {
         JSONArray dataArr = new JSONArray();
-        if (predY.size() > 0) {
+        if (predY != null && predY.size() > 0) {
             dataArr = predY.getJSONArray(0);
         }
         return dataArr;