Signal errors in QXmlStreamWriter upstream.

Unfortunately the method is only avaiable in Qt >= 4.8.
Not much we can do about that.

src/format/KeePass2XmlWriter.cpp

@@ -57,6 +57,12 @@ void KeePass2XmlWriter::writeDatabase(QIODevice* device, Database* db, KeePass2R
     m_xml.writeEndElement();
 
     m_xml.writeEndDocument();
+
+#if QT_VERSION >= QT_VERSION_CHECK(4, 8, 0)
+    if (m_xml.hasError()) {
+        raiseError(device->errorString());
+    }
+#endif
 }
 
 void KeePass2XmlWriter::writeDatabase(const QString& filename, Database* db)