properly check for ftfy and warn if unavailable in all pipelines

[catwell]

What does this PR do?

Harmonize all pipelines regarding use of ftfy: warn but do not crash if unavailable.

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Did you read the contributor guideline?
• Did you read our philosophy doc ?
• Was this discussed/approved via a GitHub issue or the forum?
• Did you make sure to update the documentation with your changes? Here are the
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  here are tips on formatting docstrings.
• Did you write any new necessary tests?

Who can review?

• Pipelines and pipeline callbacks: @yiyixuxu and @asomoza