Ingo Bürk b9b1a60b5d Fix segfault when calling "i3 -C".
Commit 287a0b4 introduced a segfault when validating the i3 config
as the root_screen will not be set in this case, causing a null
pointer dereference.

fixes #2144
2016-01-05 22:50:38 -05:00
..
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