Default printout (used for order, packing lists, invoices etc) was raising
error for deliveries with cells when the resource descrption was only \n

See merge request nexedi/erp5!1253

erp5_user_tutorial_ui_test: dependency on erp5_accounting was missing (account_module).

runUnitTest: log_directory is imported from Unit Tests and thus must be global to avoid pylint error.

using command:

    msgattrib bt5/erp5_l10n_fr/MessageTranslationTemplateItem/fr/erp5_ui/translation.po --no-fuzzy --translated -s --no-wrap -o  bt5/erp5_l10n_fr/MessageTranslationTemplateItem/fr/erp5_ui/translation.po

See merge request !1251

1. set 0 as default value, otherwise leaflet_display_side will always be true
2. show message instead of crash
3. correct parameters
4. clean code

(and translate this to french as well)