public boolean isErrorPlaceholder() {
		return false;
	}
If a PrototypeModel fails to parse (from XML) a substitute model may be provided, in which
case this method returns true.  In all other cases this method returns false;
@return true if this object is a substitute for a model that didn't parse
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/lang/PrototypeModel.java