When moving a display outside of the range of the main monitor, switchboard crashes

When you move a second monitor above of the origional one, the settings app fails to save the display state.

Demonstration:
https://www.youtube.com/watch?v=Oj2ssx8VTqw

Error output:
http://pastebin.com/XWBmdMMn

This makes a lot of monitor configurations impossible.

Launchpad Details: [#LP1660422](https://bugs.launchpad.net/bugs/1660422) Jeroen - 2017-01-30 19:05:17 +0000

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