- Prevent front() on empty directories; fixed T28658 - Filter out non dicom files (by extension); fixed T28659
- Prevent front() on empty directories; fixed T28658
- Filter out non dicom files (by extension); fixed T28659

MITK/MITK,MITK/MITK,MITK/MITK,MITK/MITK,MITK/MITK,MITK/MITK