regression brought by commit 58e43592546fc02a2dd9d363254464a67e3ae2e2
that supposes that a list custom field has always multiple values
	modifié:         app/controllers/importer_controller.rb
Merge pull request #24 from Utopism/master

regression brought by commit 58e43592546fc02a2dd9d363254464a67e3ae2e2