Can't set title to empty string

[1j01]

Just noticed this deficiency:

os-gui/$Window.js

Line 1480 in bb4df0f

if (title) {

It's a jQuery-style method that either sets or gets the title, but empty strings are falsy so this would be a slight pitfall as it would simply return the current title instead of setting it to the empty string.

[1j01]

Fixed in 596488a