info window crash if closed by "x" or [Esc]

[ohan-se]

The info window can be closed for example by:

• Clicking the "[Close]-button" in the info window.
• Clicking the "[x]-button" in the corner of the window.
• Pressing the "[Esc]-key" on the keyboard.
• Pressing the "[Alt]+[F4]-keys" on the keyboard.

If closing the info window using the "[Close]-button", it can be re-opened and displays the info again.

BUG: Upon closing the info window using the "[x]-button" or the "[Esc]-key" or the "[Alt]+[F4]-keys", re-opening the info window displays and empty window without the info.

(Restarting redshift resets to previous behavior.)