when calling model.getRuntimeProperties error handling needs to be present

If someone writes code that omits a requires to import a model, they will later get an inscrutable stack trace that says that model.getRuntimeProperties is undefined.

It is not even possible to set a breakpoint on the line and reload to see what model is the problem; the reader has to find the call buried in the stack trace that references the model name.

Instead, if getRuntimeProperties is undefined, the code should at least print out the name of the model that's undefined and suggest that the user has missed a requires statement. In a perfect universe, it would tell the author which model is missing the requires, too.