When filtering the uncategorized page by a time window, completely hide
jobs that have no uncategorized failures in said time window.
Hide entries in the menu that have no hits in the window as well.
This patch doesn't dynamically update any numbers to only show what is
visible in the window.
Also add debug info to web_server script.
Change-Id: I2fd792a1a202a70a3dedd20316b3c4fdd8fcdc6e
f5a0e015ae