re #8156: Does not try to find file path twice

The _data_file is already a full_path in this stage. It is useless, and,
as showed, error_prone to try to do it.
re #8156 correct getFilePathFromWorkspace

It could be different, but it is necessary to wait to fix #8158.
Merge remote-tracking branch 'origin/bugfix/8156_assign_processed_data'