In fact the export fails because you don't provide any filter options. The "csv" filter is not able to operate without them.
ScDocShell::ConvertTo works fine without options, it uses default values then.
Unfortunately the API (storeTo/AsURL) does not allow to throw a suitable exception (an API bug we can't fix without losing compatibility), so the error is not notified to the caller. There seems to be an additional bug that the empty file is not removed, I roughly remember to have seen such an issue some time ago.
A file with a single line feed character sounds more like an empty sheet was saved (successfully). Remember that CSV saves only the current sheet.
Niklas
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