logic: Fixed crashes and halting during indexing

* Fixed CPPSqliteException being thrown due to not properly destructed statement in addError
* Fixed indexer getting stuck after building caches because MessageFinishedParsing was interrupted
* removed Message::cancel() method and all related code

bug id = 105

src/lib/utility/messaging/MessageBase.h

@@ -11,7 +11,6 @@ public:
 		: m_isReplayed(false)
 		, m_sendAsTask(true)
 		, m_keepContent(false)
-		, m_cancelled(false)
 		, m_isLast(true)
 		, m_isLogged(true)
 	{
@@ -74,16 +73,6 @@ public:
 		return m_keepContent;
 	}
 
-	void cancel()
-	{
-		m_cancelled = true;
-	}
-
-	bool cancelled()
-	{
-		return m_cancelled;
-	}
-
 	virtual void print(std::ostream& os) const = 0;
 
 	std::string str() const
@@ -98,7 +87,6 @@ private:
 	bool m_isReplayed;
 	bool m_sendAsTask;
 	bool m_keepContent;
-	bool m_cancelled;
 	bool m_isLast;
 	bool m_isLogged;
 };

src/lib/utility/messaging/MessageQueue.cpp

@@ -253,11 +253,6 @@ void MessageQueue::sendMessage(std::shared_ptr<MessageBase> message)
 			listener->handleMessageBase(message.get());
 			m_listenersMutex.lock();
 		}
-
-		if (message->cancelled())
-		{
-			break;
-		}
 	}
 }
 
@@ -277,7 +272,7 @@ void MessageQueue::sendMessageAsTask(std::shared_ptr<MessageBase> message, bool
 				[listenerId, message]()
 				{
 					MessageListenerBase* listener = MessageQueue::getInstance()->getListenerById(listenerId);
-					if (listener && !message->cancelled())
+					if (listener)
 					{
 						listener->handleMessageBase(message.get());
 					}

src/lib/utility/messaging/type/MessageFinishedParsing.h

@@ -25,11 +25,6 @@ public:
 		return "MessageFinishedParsing";
 	}
 
-	virtual void dispatch()
-	{
-		Message<MessageFinishedParsing>::dispatch();
-	}
-
 	std::string getStatusStr() const
 	{
 		if (loadedOnly)