Ignore empty Layout in clean-svg.py #1200

Job	Run time
valgrind	49s
build-and-dist (gcc)	2m 47s
build-and-dist (gcc, -Db_sanitize=address,undefined -Db_lundef=false)	4m 15s
build-and-dist (clang)	2m 9s
build-and-dist (clang, -Db_sanitize=address,undefined -Db_lundef=false)	1m 39s
build-from-tarball	1m 52s
duplicate-devices	1m 40s
etcdir (sudo mv /usr/share/libwacom/wacom-intuos*.tablet /etc/libwacom)	2m 6s
clean-svg-check	33s
etcdir (sudo mv /usr/share/libwacom/*.tablet /etc/libwacom)	1m 50s
etcdir (sudo mv /usr/share/libwacom/*.stylus /etc/libwacom)	1m 52s
etcdir (sudo mv /usr/share/libwacom/*.tablet $HOME/.config/libwacom)	1m 25s
etcdir (sudo mv /usr/share/libwacom/*.stylus $HOME/.config/libwacom)	2m 13s
etcdir (sudo mv /usr/share/libwacom/wacom-*.tablet $HOME/.config/libwacom && sudo mv /usr/share/l...	39s
etcdir (sudo csplit data/wacom.stylus '/^\[0x822\]/' && sudo mv xx00 /etc/libwacom/first.stylus &...	30s
	26m 19s

Provide feedback