cubicweb-forge #744390 cannot add attachement on non open ticket [open]

If I have a ticket in state "waiting for more information", it is not possible to attach a document on that ticket.

This means that, in order to provide the requested information, I need to change the state first, and then provide feedback which is not natural.

Additionally, the message I get is "You are not allowed to perform add operation on relation Ticket attachment File" which does not give any hint on the cause of the problem. When the state of an entity is the cause for an operation not being possible, this should be clearly mentioned in the error message (and one could argue that the operation should not be available in the first place).

done in<not specified>
closed by<not specified>