In BA plugin, editor crashes when using a dequeue action on something that is not an event [data] port

[Etienne13]

Summary

After parsing a dequeue action applied to a reference that is not an event [data] port, the type checker fails with a NPE and therefore the aadl editor crashes.

Steps to Reproduce

1. open the following example
2. the editor fails because of an error in the BA plugin; i crashes instead of reporting an error

package test_dequeue_data_port

public

  thread t
  features
    d_in: in data port d;
  annex behavior_specification {**
  variables
    v: d;
  states
    s: initial complete final state;
  transitions
    s-[on dispatch]->s
    {
    	d_in?(v);
    	d_in?
    };
  **};
  end t;
  
  
  data d
  end d;

end test_dequeue_data_port;

Environment

• OSATE Version: 2.9.0
• Operating System: Ubuntu 18.04