grid style problem with {-}

[aridus]

With the grid-style I have noticed that inclusion of {-} after a heading, to remove the chapter number, viz

Introduction {-}

results in an incorrectly formatted header.

Thanks.

[fyuniv]

In the html code, there is <h1> missing in front of Introduction. Can you please fix this issue! Thank you!
Can you please check lines 125 and 126 in msmb_html.R.