[Erp5-dev] TaskConstraint proposition

[Mikolaj Antoszkiewicz]

Hi All,

Since the Order_validateData script for task_workflow has been removed,
I propose a proper TaskConstraint replacement to verify task consistency 
before confirmation, so that Task Report could be generated.

TaskLineCategoryExistence constraint class handles the more complicated 
check for existence of specific category ('reference' in our case) on 
all contained Task Lines.

There is no constraint on destination_decision, since I assume there 
doesn't have to be a task assignor (and it's not compulsory for the Task 
Report generation), but without it (and with destination  not a 
'Person'), the notifyAssignee script raises an Exception and stops Task 
Report building.
I'm attaching two patches for the notifications scripts, which fix the 
problem mentioned above.

Mikolaj
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