avoided some null pointers

src/main/java/eu/siacs/conversations/generator/AbstractGenerator.java

@@ -20,7 +20,7 @@ public abstract class AbstractGenerator {
 			"http://jabber.org/protocol/disco#info",
 			"urn:xmpp:avatar:metadata+notify",
 			"urn:xmpp:ping"};
-	public final String IDENTITY_NAME = "Conversations 0.8.3";
+	public final String IDENTITY_NAME = "Conversations 0.9-alpha";
 	public final String IDENTITY_TYPE = "phone";
 
 	protected XmppConnectionService mXmppConnectionService;

src/main/java/eu/siacs/conversations/parser/IqParser.java

@@ -1,5 +1,8 @@
 package eu.siacs.conversations.parser;
 
+import android.util.Log;
+
+import eu.siacs.conversations.Config;
 import eu.siacs.conversations.entities.Account;
 import eu.siacs.conversations.entities.Contact;
 import eu.siacs.conversations.services.XmppConnectionService;
@@ -73,12 +76,15 @@ public class IqParser extends AbstractParser implements OnIqPacketReceived {
 				Element query = packet.findChild("query");
 				this.rosterItems(account, query);
 			}
+		} else {
+			if (packet.getFrom() == null) {
+				Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": received iq with invalid from "+packet.toString());
+				return;
 			} else if (packet.hasChild("open", "http://jabber.org/protocol/ibb")
 					|| packet.hasChild("data", "http://jabber.org/protocol/ibb")) {
 				mXmppConnectionService.getJingleConnectionManager()
 						.deliverIbbPacket(account, packet);
-		} else if (packet.hasChild("query",
-				"http://jabber.org/protocol/disco#info")) {
+			} else if (packet.hasChild("query", "http://jabber.org/protocol/disco#info")) {
 				IqPacket response = mXmppConnectionService.getIqGenerator()
 						.discoResponse(packet);
 				account.getXmppConnection().sendIqPacket(response, null);
@@ -97,5 +103,6 @@ public class IqParser extends AbstractParser implements OnIqPacketReceived {
 				}
 			}
 		}
+	}
 
 }

src/main/java/eu/siacs/conversations/xmpp/stanzas/AbstractStanza.java

@@ -36,12 +36,16 @@ public class AbstractStanza extends Element {
 	}
 
 	public void setTo(final Jid to) {
+		if (to != null) {
 			setAttribute("to", to.toString());
 		}
+	}
 
 	public void setFrom(final Jid from) {
+		if (from != null) {
 			setAttribute("from", from.toString());
 		}
+	}
 
 	public void setId(final String id) {
 		setAttribute("id", id);