cubicweb #1827350 crash at startup when simpletal is not installed [rejected]

if an instance uses more than 1 cube, then at startup cubicweb.mttransforms is imported more than once (via the cube loading mechanism). If simpletal is not installed, then

from cubicweb import schema
schema.NEED_PERM_FORMATS.remove('text/cubicweb-page-template')

is executed more than once, and will crash on the second time the call is made (because the value is no longer in the list).

priorityimportant
typebug
done in<not specified>
load0.000
load left0.000
closed by<not specified>