506863bf57
config_map.erase() is only called in ExportHandler::finish_timespan(). When an export fails (throw) or is aborted, the export-handler's config remains as is and the next export will run it again. The export-handler is global, per session and ExportHandler::add_export_config() only ever inserts or ignores insert. This is in preparation to fix: 1) export to invalid path -> fail, error is thrown 2) correct path -> new config is inserted in the map 3) try to export again, first runs the not-completed export from (1) -> constant errors.
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