Checking for null certs.

Author: abmargb

src/main/java/org/fogbowcloud/rendezvous/xmpp/RendezvousPacketHelper.java

@@ -61,7 +61,8 @@ public static RendezvousItem getWhoIsAliveResponseItem(
 			Element itemEl) throws ParseException {
 		Attribute id = itemEl.attribute("id");
 		Element statusEl = itemEl.element("status");
-		String cert = itemEl.element("cert").getText();
+		Element certEl = itemEl.element("cert");
+		String cert = certEl == null ? null : certEl.getText();
 		String cpuIdle = statusEl.element("cpu-idle").getText();
 		String cpuInUse = statusEl.element("cpu-inuse").getText();
 		String memIdle = statusEl.element("mem-idle").getText();

src/main/java/org/fogbowcloud/rendezvous/xmpp/handler/WhoIsAliveHandler.java

@@ -1,7 +1,6 @@
 package org.fogbowcloud.rendezvous.xmpp.handler;
 
 import java.util.List;
-import java.util.concurrent.locks.Condition;
 
 import org.dom4j.Element;
 import org.fogbowcloud.rendezvous.core.Rendezvous;

src/main/java/org/fogbowcloud/rendezvous/xmpp/handler/WhoIsAliveSyncHandler.java

@@ -96,8 +96,10 @@ private IQ createResponse(IQ iq, RendezvousImpl rendezvousImpl,
 			RendezvousItem item = (RendezvousItem) rsmItem;
 			Element managerEl = managersEl.addElement("manager");
 			managerEl.addAttribute("id", item.getResourcesInfo().getId());
-			managerEl.addElement("cert").setText(
-					item.getResourcesInfo().getCert());
+			String cert = item.getResourcesInfo().getCert();
+			if (cert != null) {
+				managerEl.addElement("cert").setText(cert);
+			}
 			Element statusEl = managerEl.addElement("status");
 			statusEl.addElement("cpu-idle").setText(
 					item.getResourcesInfo().getCpuIdle());