Adds error logging when no metacontact found for contactID, used for opening chat window for recent chats source contacts from the UI.

src/net/java/sip/communicator/impl/gui/main/chat/ChatWindowManager.java

@@ -945,6 +945,15 @@ public void startChat(String contactID, ProtocolProviderService pps)
                 MetaContact metaContact = GuiActivator.getContactListService()
                     .findMetaContactByContact(c);
 
+                if(metaContact == null)
+                {
+                    logger.error(
+                        "Chat not started. Cannot find metacontact for "
+                        + contactID + " and protocol:" + pps);
+
+                    return;
+                }
+
                 startChat(metaContact, c, false);
                 return;
             }