Merge pull request #1283 from arnaudbore/add_save_empty_cut_tractogram

[ENH] Add no empty option

Author: arnaudbore

src/scilpy/cli/scil_tractogram_cut_streamlines.py

@@ -97,6 +97,8 @@ def _build_arg_parser():
     p.add_argument('--min_length', type=float, default=0,
                    help='Minimum length of streamlines to keep (in mm) '
                         '[%(default)s].')
+    p.add_argument('--no_empty', action='store_true',
+                   help='Do not write file if there is no streamline.')
 
     g = p.add_argument_group('Cutting options', 'Options for cutting '
                              'streamlines with --mask.')
@@ -191,7 +193,7 @@ def main():
         new_sft = StatefulTractogram.from_sft(
             compressed_strs, sft, data_per_streamline=sft.data_per_streamline)
 
-    save_tractogram(new_sft, args.out_tractogram)
+    save_tractogram(new_sft, args.out_tractogram, args.no_empty)
 
 
 if __name__ == "__main__":