Image can't convert to Bitmap if layer mask is selected
[bug report]
When converting an image to Bitmap via Actions, if a layer's mask is selected, Photoshop displays the error "The command “Convert Mode” is not currently available."

(When performing this operation without Actions, `Image > Mode > Bitmap` is simply unavailable)
The only way to enable conversion to Bitmap is to select either the layer itself or another layer.
It makes no sense for conversion to Bitmap to be disabled if a mask is selected. This is a bug that impacts my day to day work.
