@Override
	public String getValueAsString(KeyedObject o) {
		Object v;
		if (values.containsKey(o.key())) {
			v = getValue(o);
			if (v != null) {
				return v.toString();
			}
		}
		return emptyString;
	}
Return the attribute of the specified KeyedObject as a String.
Ghidra/Framework/Generic/src/main/java/ghidra/util/graph/attributes/ObjectAttribute.java