api: force users to explicitly define whether to sort files

Author: satra

nipype/interfaces/io.py

@@ -356,7 +356,7 @@ class DataGrabberInputSpec(DynamicTraitedSpec, BaseInterfaceInputSpec):  # Inter
                                desc='Path to the base directory consisting of subject data.')
     raise_on_empty = traits.Bool(True, usedefault=True,
                                  desc='Generate exception if list is empty for a given field')
-    sort_filelist = traits.Bool(False, usedefault=True,
+    sort_filelist = traits.Bool(mandatory=True,
                                 desc='Sort the filelist that matches the template')
     template = traits.Str(mandatory=True,
                           desc='Layout used to get files. relative to base directory if defined')