clean some code

cat-home/src/main/java/com/dianping/cat/report/page/monitor/Handler.java

@@ -96,6 +96,7 @@ public class Handler implements PageHandler<Context> {
 
 			Metric metric = Cat.getProducer().newMetric(group, key);
 			DefaultMetric defaultMetric = (DefaultMetric) metric;
+			
 			if (defaultMetric != null) {
 				defaultMetric.setTimestamp(time);
 			}

cat-home/src/main/java/com/dianping/cat/report/page/monitor/Payload.java

@@ -123,9 +123,6 @@ public class Payload extends AbstractReportPayload<Action> {
 		if (m_action == null) {
 			m_action = Action.COUNT_API;
 		}
-		if(m_type == null) {
-			m_type = "network";
-		}
 	}
 	
 }

cat-home/src/main/java/com/dianping/cat/report/task/exceptionAlert/ExceptionAlert.java

@@ -66,6 +66,7 @@ public class ExceptionAlert implements Task, LogEnabled {
 	private TopMetric buildTopMetric(Date date) {
 		TopReport topReport = queryTopReport(date);
 		TopMetric topMetric = new TopMetric(ALERT_PERIOD, Integer.MAX_VALUE, m_configManager);
+		
 		topMetric.setStart(date).setEnd(new Date(date.getTime() + TimeUtil.ONE_MINUTE));
 		topMetric.visitTopReport(topReport);
 		return topMetric;
@@ -149,7 +150,6 @@ public class ExceptionAlert implements Task, LogEnabled {
 		for (List<Item> item : items) {
 			for (Item i : item) {
 				String domain = i.getDomain();
-
 				ExceptionLimit totalExceptionLimit = m_configManager.queryDomainTotalLimit(domain);
 				int totalWarnLimit = -1;
 				int totalErrorLimit = -1;