Add an Empty grid class The need turned up for the flexural code when we may or may not have a grid for the open water and want to plot that solution. In case there is no open water we need an empty grid to plot the empty gridfunction against to avoid errors.

function prof(f)
    profile on
    try
        f();
        profile viewer
    catch e
        fprintf(2, '\n%s', getReport(e));
        profile clear
    end
end