[CWEP002] Account for attribute formula in schema bootstrap
This isn't enough to have computed attribute support, it is only in order not to
crash when yams 0.40 is used.
Related to #3546717.
include *.pyinclude */*.pyrecursive-include data *.gif *.png *.ico *.css *.jsrecursive-include i18n *.porecursive-include wdoc *