No warning before exporting files from smart previews

Please add a warning dialog, if one tries to export from smart preview files.
I learnt the hard way, that Lightroom exports files no matter what. Unnoticed I had lost my server connection, when I exported some files. The resulting files were a lot smaller than my usual photos and it seemed to me as if I had made some wrong settings. I spent literally the entire night looking for solutions online, until it dawned to me the next morning, that the culprit was the missing server connection. So please, please, please add a warning dialog to the export functions, once one tries to export from smart preview files.