Override reference checking for PUBLICIZE transaction type

src/main/java/org/qortal/transaction/PublicizeTransaction.java

@@ -75,6 +75,11 @@ public class PublicizeTransaction extends Transaction {
 		return ValidationResult.OK;
 	}
 
+	@Override
+	public boolean hasValidReference() throws DataException {
+		return true;
+	}
+
 	@Override
 	public ValidationResult isValid() throws DataException {
 		// There can be only one