exception message added onFailure for GeneratorNode

rule-engine/rule-engine-components/src/main/java/org/thingsboard/rule/engine/debug/TbMsgGeneratorNode.java

@@ -117,7 +117,7 @@ public class TbMsgGeneratorNode implements TbNode {
                         }
                     },
                     t -> {
-                        log.warn("onMsg onFailure callback, took {}ms, config {}, msg {}", sw.stopAndGetTotalTimeMillis(), config, msg);
+                        log.warn("onMsg onFailure callback, took {}ms, config {}, msg {}, exception {}", sw.stopAndGetTotalTimeMillis(), config, msg, t);
                         if (initialized.get() && (config.getMsgCount() == TbMsgGeneratorNodeConfiguration.UNLIMITED_MSG_COUNT || currentMsgCount < config.getMsgCount())) {
                             ctx.tellFailure(msg, t);
                             scheduleTickMsg(ctx);