[gnome-nibbles] Remove wall-empty.svg

[Michael Catanzaro <mcatanzaro src gnome org>]

commit b6afac22d409cb2be15c0da2570d432ab6f3335f
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Sun Feb 7 23:23:26 2016 -0600

    Remove wall-empty.svg
    
    It ain't used anymore

 data/pix/Makefile.am    |    1 -
 data/pix/wall-empty.svg |  149 -----------------------------------------------
 2 files changed, 0 insertions(+), 150 deletions(-)
---
diff --git a/data/pix/Makefile.am b/data/pix/Makefile.am
index 6ea3830..bab73b5 100644
--- a/data/pix/Makefile.am
+++ b/data/pix/Makefile.am
@@ -22,7 +22,6 @@ SMALL_PIX = \
        wall-corner-top-left.svg \
        wall-corner-top-right.svg \
        wall-cross.svg \
-       wall-empty.svg \
        wall-straight-side.svg \
        wall-straight-up.svg \
        wall-tee-down.svg \