Bugfix
Detail
#28257
NullPointerException instead of error message for invalid override in model file
If you declare an override in a model file, although the type on which the overridden property is declared does not inherit a property with the same name, a NullPointerException is thrown without a useful error message being issued.
Test
In tl-demo, declare a reference of DemoTypes:A as override="true", which does not overwrite anything. Error must be reported at boot.