[mkgmap-dev] Commit: r2136: Catch the case where there is only one pixel defined and it is

Version 2136 was commited by steve on 2011-12-03 19:00:57 +0000 (Sat, 03 Dec 2011) Catch the case where there is only one pixel defined and it is transparent. It seems that the best way to represent that is with colour mode 0x20.