Fix NPEs

src/org/thoughtcrime/securesms/ConversationListItem.java

@@ -113,7 +113,8 @@ public class ConversationListItem extends RelativeLayout
   }
 
   public void unbind() {
-    this.recipients.removeListener(this);
+    if (this.recipients != null)
+      this.recipients.removeListener(this);
   }
 
   private void initializeContactWidgetVisibility() {

src/org/thoughtcrime/securesms/crypto/KeyExchangeProcessor.java

@@ -111,8 +111,10 @@ public class KeyExchangeProcessor {
 
     sessionRecord.save();
 
-    DatabaseFactory.getIdentityDatabase(context)
+    if (message.hasIdentityKey()) {
-                   .saveIdentity(masterSecret, recipient, message.getIdentityKey());
+      DatabaseFactory.getIdentityDatabase(context)
+                     .saveIdentity(masterSecret, recipient, message.getIdentityKey());
+    }
 
     DecryptingQueue.scheduleRogueMessages(context, masterSecret, recipient);