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* Fixes "'DetailsPanel' object has no attribute '_table'" error on shutdown if the Results table is updated (item removed) while the Details Dialog is shown as a floating window. * It seems that QApplication.quit() triggers some sort of refresh on the floating QDockWidget, which in turn makes calls to the underlying model that is possibly being destroyed, ie. there might be a race condition here. * Closing or hiding the QDockWidget before the cal to quit() is a workaround. Similarly, this is already done in the quitTriggered() method anyway. * This fixes #857.