Set source CIDR list when updating if it is not null

Author: winterhazel

server/src/main/java/com/cloud/network/rules/RulesManagerImpl.java

@@ -1684,7 +1684,7 @@ public PortForwardingRule updatePortForwardingRule(UpdatePortForwardingRuleCmd c
             rule.setDestinationIpAddress(dstIp);
         }
 
-        if (CollectionUtils.isNotEmpty(sourceCidrList)) {
+        if (sourceCidrList != null) {
             rule.setSourceCidrList(sourceCidrList);
         }