Oh oops, I added an optional `subtitle` argument for the item table
list row template, but didn't realize that it would crash in cases when
not provided! Now, we add an initializer to set it to `nil` if
undefined.
Note that there's a known performance issue here: we should try to
fetch all the OWLS values at once, instead of doing them in sequence
while rendering the page!
Clearer focus states, row changes bg color on hover/focus to help you
track where you are, remove the redundant image thumbnail link from the
tab order (it's the same as the item name link!)
