[mkgmap-dev] Commit r3805: correction: don't add null to usedTags collection for style functions like is_closed() or area_size()

Version mkgmap-r3805 was committed by gerd on Wed, 15 Feb 2017 correction: don't add null to usedTags collection for style functions like is_closed() or area_size() http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=3805