apache#4141: return empty list if config is null

Author: ustcweizhou

api/src/main/java/com/cloud/agent/api/to/LoadBalancerTO.java

@@ -185,8 +185,9 @@ public LoadBalancerConfigTO[] getLbConfigs() {
     }
 
     public void setLbConfigs(List<? extends LoadBalancerConfig> lbConfigs) {
-        if (lbConfigs == null) {
-            lbConfigs = new ArrayList<LoadBalancerConfig>();
+        if (lbConfigs == null || lbConfigs.size() == 0) {
+            this.lbConfigs = new LoadBalancerConfigTO[0];
+            return;
         }
         this.lbConfigs = new LoadBalancerConfigTO[lbConfigs.size()];
         int i = 0;

core/src/main/java/com/cloud/agent/api/routing/LoadBalancerConfigCommand.java

@@ -25,7 +25,6 @@
 
 import org.apache.cloudstack.network.lb.LoadBalancerConfig;
 
-import java.util.ArrayList;
 import java.util.List;
 
 /**
@@ -88,8 +87,9 @@ public LoadBalancerConfigTO[] getNetworkLbConfigs() {
     }
 
     public void setNetworkLbConfigs(List<? extends LoadBalancerConfig> networkLbConfigs) {
-        if (networkLbConfigs == null) {
-            networkLbConfigs = new ArrayList<LoadBalancerConfig>();
+        if (networkLbConfigs == null || networkLbConfigs.size() == 0) {
+            this.networkLbConfigs = new LoadBalancerConfigTO[0];
+            return;
         }
         this.networkLbConfigs = new LoadBalancerConfigTO[networkLbConfigs.size()];
         int i = 0;