Fixed the 'QSqlDatabasePrivate::removeDatabase: connection 'qt_sql_default_connection' is still in use, all queries will cease to work.' error.
Fixed the 'QSqlDatabasePrivate::removeDatabase: connection 'qt_sql_default_connection' is still in use, all queries will cease to work.' error.

wimleers/QVisualizer,wimleers/QVisualizer,wimleers/QVisualizer