public PropertyPath merge(final PropertyPath otherPath) {
        if (otherPath == null || otherPath.isBlank()) {
            return this;
        } else {
            return new PropertyPath(this.getParts(), otherPath.getParts());
        }
    }
Merge otherPath onto the end of this and return a new {@link PropertyPath}
stroom-util-shared/src/main/java/stroom/util/shared/PropertyPath.java