more explicit select files error message

Author: chrisgorgo

nipype/interfaces/io.py

@@ -688,7 +688,7 @@ def _list_outputs(self):
  # Handle the case where nothing matched
  if not filelist:
  msg = "No files were found matching %s template: %s" % (
- field, template)
+ field, filled_template)
  if self.inputs.raise_on_empty:
  raise IOError(msg)
  else: