[bugfix] Correct copying of Dataset.
[bugfix] Correct copying of Dataset.

fsrajer/yasfm,fsrajer/yasfm,fsrajer/yasfm,fsrajer/yasfm,fsrajer/yasfm,fsrajer/yasfm,fsrajer/yasfm,fsrajer/yasfm,fsrajer/yasfm,fsrajer/yasfm