GP-2021 varnode null issue refactor

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/pcode/Varnode.java

@@ -292,15 +292,7 @@ public class Varnode {
 	 * @return the lone descendant PcodeOp
 	 */
 	public PcodeOp getLoneDescend() {
-		Iterator<PcodeOp> iter = getDescendants();
+		return null;
-		if (!iter.hasNext()) {
-			return null;		// If there are no descendants return null
-		}
-		PcodeOp op = iter.next();
-		if (iter.hasNext()) {
-			return null;		// If there is more than one descendant return null
-		}
-		return op;
 	}
 
 	/**

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/pcode/VarnodeAST.java

@@ -94,6 +94,19 @@ public class VarnodeAST extends Varnode {
 		return descend.iterator();
 	}
 	
+	@Override
+	public PcodeOp getLoneDescend() {
+		Iterator<PcodeOp> iter = getDescendants();
+		if (!iter.hasNext()) {
+			return null;		// If there are no descendants return null
+		}
+		PcodeOp op = iter.next();
+		if (iter.hasNext()) {
+			return null;		// If there is more than one descendant return null
+		}
+		return op;
+	}
+
 	@Override
 	public Address getPCAddress() {
 		if (bInput) {