request #6629: Fatal error with cards semantic for unknown field

Change-Id: I94dcb37ee035a146ab73177ed5acf98d87089c63
Merge commit 'refs/changes/38/2238/1' of ssh://gerrit.tuleap.net:29418/tuleap into stable

* ssh://gerrit.tuleap.net:29418/tuleap:
  request #6629: Fatal error with cards semantic for unknown field
This is Tuleap 6.12.99.8

Change-Id: I00d21f520ac15379a267bbf71b6c4b962173bb5b