@Nullable
    public static Viewport containing(final Collection<? extends ICoordinate> points) {
        return containing(points, false, null);
    }
Return the smallest viewport containing all the given points.

@param points a set of points. Points with null coordinates (or null themselves) will be ignored
@return the smallest viewport containing the non-null coordinates, or null if no coordinates are non-null
main/src/main/java/cgeo/geocaching/location/Viewport.java