Merge branch '67-zt-files-are-processed-even-when-no-zt-processing-is-wanted'...

Merge branch '67-zt-files-are-processed-even-when-no-zt-processing-is-wanted' of https://gitlab.idiap.ch/bob/bob.bio.base into 67-zt-files-are-processed-even-when-no-zt-processing-is-wanted

Conflicts:
	bob/bio/base/test/test_scripts.py
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