fixed NPE in Flow output node when it used after split array msg node

common/message/src/main/java/org/thingsboard/server/common/msg/TbMsgProcessingCtx.java

@@ -64,7 +64,12 @@ public final class TbMsgProcessingCtx implements Serializable {
     }
 
     public TbMsgProcessingStackItem pop() {
-        return !stack.isEmpty() ? stack.removeLast() : null;
+        if (stack == null) {
+            throw new RuntimeException("Stack is null!");
+        } else if (stack.isEmpty()) {
+            return null;
+        }
+        return stack.removeLast();
     }
 
     public static TbMsgProcessingCtx fromProto(MsgProtos.TbMsgProcessingCtxProto ctx) {

rule-engine/rule-engine-components/src/main/java/org/thingsboard/rule/engine/transform/TbSplitArrayMsgNode.java

@@ -77,8 +77,10 @@ public class TbSplitArrayMsgNode implements TbNode {
                         ctx.tellFailure(msg, e);
                     }
                 });
-                data.forEach(msgNode -> ctx.enqueueForTellNext(TbMsg.newMsg(msg.getQueueName(), msg.getType(), msg.getOriginator(), msg.getMetaData(), JacksonUtil.toString(msgNode)),
+                data.forEach(msgNode -> {
-                        TbRelationTypes.SUCCESS, wrapper::onSuccess, wrapper::onFailure));
+                    TbMsg outMsg = TbMsg.transformMsg(msg, msg.getType(), msg.getOriginator(), msg.getMetaData(), JacksonUtil.toString(msgNode));
+                    ctx.enqueueForTellNext(outMsg, TbRelationTypes.SUCCESS, wrapper::onSuccess, wrapper::onFailure);
+                });
             }
         } else {
             ctx.tellFailure(msg, new RuntimeException("Msg data is not a JSON Array!"));

rule-engine/rule-engine-components/src/test/java/org/thingsboard/rule/engine/transform/TbSplitArrayMsgNodeTest.java

@@ -96,6 +96,7 @@ public class TbSplitArrayMsgNodeTest {
         ArgumentCaptor<TbMsg> newMsgCaptor = ArgumentCaptor.forClass(TbMsg.class);
         ArgumentCaptor<Exception> exceptionCaptor = ArgumentCaptor.forClass(Exception.class);
         verify(ctx, never()).tellSuccess(any());
+        verify(ctx, never()).enqueueForTellNext(any(), anyString(), any(), any());
         verify(ctx, times(1)).tellFailure(newMsgCaptor.capture(), exceptionCaptor.capture());
 
         assertThat(exceptionCaptor.getValue()).isInstanceOf(RuntimeException.class);