Avoid reading reply data if the reply isn't open

This might be the case when the request has been aborted. Reading from the
reply in this case would result in an unwanted log message from Qt.

connector/syncthingconnection_requests.cpp

@@ -111,7 +111,7 @@ SyncthingConnection::Reply SyncthingConnection::prepareReply(QList<QNetworkReply
 SyncthingConnection::Reply SyncthingConnection::handleReply(QNetworkReply *reply, bool readData, bool handleAborting)
 {
     const auto log = m_loggingFlags & SyncthingConnectionLoggingFlags::ApiReplies;
-    readData = readData || log;
+    readData = (readData || log) && reply->isOpen();
     handleAborting = handleAborting && m_abortingAllRequests;
     const auto data = Reply{
         .reply = handleAborting ? nullptr : reply, // skip further processing if aborting to reconnect