bug修复

@@ -84,8 +84,12 @@ public class ZabbixIpTask implements Callable {
         }
         List<ZabbixHostInfo> hostInfoList = hostMapper.queryHostInfo(ipList);
 
+
         DEBUG.info("Found host ip to id info {}", hostInfoList);
 
+        if (null == hostInfoList) {
+            return;
+        }
         //after query,save into map
         for (ZabbixHostInfo hostInfo : hostInfoList) {
 
@@ -125,6 +129,10 @@ public class ZabbixIpTask implements Callable {
 
         DEBUG.info("Found id to items info {}", itemInfoList);
 
+        if (null == itemInfoList) {
+            return;
+        }
+        
         for (ZabbixItemInfo itemInfo : itemInfoList) {
             List<ZabbixItemInfo> itemInfos = Constants.HOSTID_TO_ITEMS.get(itemInfo.getHostId());