Remove matrix

[lborcard]

Dear authors,

First I would like to tell you that I really like your package and especially the way the annotation systems works. In the context of my work I need to annotate dendrogram and it turns out that no package comes close to the ease of use that yours offers. The only issue for me is that I often do not need the heatmap but only need the dendrogram. Thus, I was wondering there is a possibility to remove the heatmap to only have a dendrogram?

Best regards,

Loïc