lightdm-webkit-greeter when no user-selected icon shows wrong icon

Linux Mint 19, lightdm-webkit-greeter 0.1.2-0ubuntu4

Priority: low

I'm the only user on my Linux Mint 19 VM. If I select an icon via

   Start - System - Preferences - Personal - About Me

that icon is shown on the greeter screen. That's good. If I don't select an icon, then according to

    /usr/share/lightdm-webkit/themes/default/index.html,

the greeter should be using the image

    image = 'file:///usr/share/icons/gnome/32x32/stock/generic/stock_person.png'

That image does not exist, but that appears not to be relevant. After removing my image, I updated index.html to display the image path:

   document.write('<td> image: ' + image + '</td>');

And even with no image assigned, the following path is still being used: "~/.face"

That file does not exist when the user has not self-selected an icon, so some other image is being displayed. To me, it looks like a image of a terminal. I don't know how this default image is being selected. A more appropriate image would be some faceless person image, which I guess was the intent of using stock/generic/stock_person.png.