Error in instantiation when using unnamed mode transitions

[lwrage]

Summary

A model with unnamed mode transitions causes an error during instantiation.

It is caused by a null pointer exception in InstanceObjectImpl.findInstanceObjectsHelper

package Issue1839
public
	
	system T
	end T;
	
	system implementation T.i
		subcomponents
			a: abstract A;
		properties
			Source_Name => "f" applies to a.f;
	end T.i;
	
	abstract A
		features
			f: in data port;
		modes
			m1: initial mode;
			m2: mode;
			m1 -[f]-> m2;
	end A;
	
end Issue1839;

Environment

• OSATE Version: 2.4.1 and 2.5.0
• Operating System: all