[pyramid] Fix 404 handling
Avoid seeing a traceback in the UI by catching it before it reaches pyramid and
restore usage of the '404' view.
Closes #16159863
[MASTER]
load-plugins=cubicweb.pylintext
ignore=__pkginfo__
[MESSAGES CONTROL]
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[BASIC]
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[CLASSES]
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_asdict,_fields,_replace,_source,_make
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