Retun an empty Path instead of null

                    final float body1 = r1 * params.mTrailBodyRatio;

                    final float body2 = r2 * params.mTrailBodyRatio;

                    final Path path = roundedLine.makePath(p1x, p1y, body1, p2x, p2y, body2);

                    if (path != null) {

                    if (!path.isEmpty()) {

                        roundedLine.getBounds(mRoundedLineBounds);

                        if (params.mTrailShadowEnabled) {

                            final float shadow2 = r2 * params.mTrailShadowRatio;

     * @param p2x the x-coordinate of the end point.

     * @param p2y the y-coordinate of the end point.

     * @param r2 the radius at the end point

     * @return the path of rounded line

     * @return an instance of {@link Path} that holds the result rounded line, or an instance of

     * {@link Path} that holds an empty path if the start and end points are equal.

     */

    public Path makePath(final float p1x, final float p1y, final float r1,

            final float p2x, final float p2y, final float r2) {

        mPath.rewind();

        final double dx = p2x - p1x;

        final double dy = p2y - p1y;

        // Distance of the points.

        final double l = Math.hypot(dx, dy);

        if (Double.compare(0.0d, l) == 0) {

            return null;

            return mPath; // Return an empty path

        }

        // Angle of the line p1-p2

        final double a = Math.atan2(dy, dx);

        mArc2.set(p2x, p2y, p2x, p2y);

        mArc2.inset(-r2, -r2);

        mPath.rewind();

        // Trail cap at P1.

        mPath.moveTo(p1x, p1y);

        mPath.arcTo(mArc1, angle, a1);