[bfss, migration] fix storage migration (closes #2189206) The storage migration intend to clean the attributes cache but in practice it was trying to discard attribut edition. As no attribut were edited this lead to a crash.

[system]

db-driver   = postgres
db-host     = localhost
db-port     = 5433
adapter     = native
db-name     = cw_fti_test
db-encoding = UTF-8
db-user     = syt
db-password = syt

[admin]
login = admin
password = gingkow