[qcookboob] undo previous modif on backends, exceptions  are handled by app

Remove useless trailing \
Remove trailing spaces
Add missing empty lines

autopep8 -ir -j2 --select=E301,E302,E502,W291,W293,W391 .

Diff quickly checked.

This does not actually fix anything; the issue was that the page was
gzipped. However, since the code was not checking anything, it took me
some time to realize it. We now have at least one "BrokenPageError"
check.

It wasn't working at all anymore.
Also fix searching with unicode characters.