Minimum height should be set for short content page

Hi,

There is a Theme issus when the page have not much content.
The problem if the page is short a big empty space appear under the footer.

To reproduce the problem
add a menu item that link to a empty category (does not have any product yet) save.
Go to that page and you will see the gap under the footer.

See attached file.

To prevent this you can set a minimum height to the main site wrapper
or fix the way it calculate the page space.

A quick fix for now is the ass a page header.