public boolean isEmpty() {
		if (vn == null) {
			return true;
		}
		return false;
	}
Constructs a ParamMeasure Object.
<b>The ParamMeasure will be empty until {@link #decode} is invoked.</b>
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/pcode/ParamMeasure.java