MOD: use empty instead of size and std::min in MultiLineEditbox
MOD: use empty instead of size and std::min in MultiLineEditbox

--HG--
branch : cppcheck-fix

cbeck88/cegui-mirror-two,cbeck88/cegui-mirror-two,cbeck88/cegui-mirror-two,cbeck88/cegui-mirror-two,cbeck88/cegui-mirror-two