When applying a preset that contains a view that has no field patterns warning notices are displayed in debug mode:

Notice: undefined index: field in .../mod/dataform/backup/moodle2/restore_dataform_stepslib.php on line 189

Warning: Invalid argument supplied for foreach() in .../mod/dataform/backup/moodle2/restore_dataform_stepslib.php on line 189

This results from assuming the existence of view and field patterns when attempting to adjust field ids of restored views.