Merge branch 'erp5_text_editor_migration' of https://lab.nexedi.com/rporchetto/erp5 into erp5_text_editor_migration

Merge branch 'erp5_text_editor_migration' of https://lab.nexedi.com/rporchetto/erp5 into erp5_text_editor_migration

erp5_web_renderjs_ui: Don't crash if form has 'Update Action Title' but no 'Form update action' defined.

Even though this is inconsistent form definition, form_dialog gadget should not crash

in MRP, we have manufacturing execution having a mix of lines with
positive and negative values. It must be possible to use split and
defer solver in that case.