Merge "libgui: check for invalid slot in attachBuffer" into lmp-dev am: af33c978c8 am: 396cc342a7 am: 91a7e47a53 am: 6a9b41dc22 am: 1f8b90126a am: 0544fa4580 am: 788ff8c16f
am: 72c1a6f762

Change-Id: Idf9fc3f7e2d09483b7e938c0c4389813dd5f2f60