String.format("Flow without a model used a prompt that referenced model var '%s'. ", modelVar));
return "";
}
String s = binder.getModelValue(modelVar);
if (s == null) {
binder.failed(m_err);
RenderErrors.logError(m_err, RenderErrors.UnknownModelVar,
String.format("can't find model var '%s'", modelVar));
s = "";
}
else