Quadrat: Hide query pagination divider if there's no pagination

[kjellr]

If there's no pagination available, we should not display the horizontal divider line for the Query Pagination:

[jffng]

I wonder if this should ultimately be addressed in the block.

That is, if there is no pagination, an empty div should not be rendered. I will take a look at fixing it there.

[kjellr]

@jffng I'm not 100% sure, but I believe this happens with many other blocks too — for example, if there's no post title, an empty div for post title still shows up on the front end.

[jeffikus]

This needs retesting.

[scruffian]

This is waiting for GB on dotcom to be updated.