file_io - make operator bool() explicit via @lightmare (https://github.com/mapnik/mapnik/commit/0d032c261863b4c1c92f5630a91b0a15dba059c3#commitcomment-16753722)
file_io - make operator bool() explicit via @lightmare (https://github.com/mapnik/mapnik/commit/0d032c261863b4c1c92f5630a91b0a15dba059c3#commitcomment-16753722)

zerebubuth/mapnik,CartoDB/mapnik,pnorman/mapnik,naturalatlas/mapnik,tomhughes/mapnik,naturalatlas/mapnik,lightmare/mapnik,pnorman/mapnik,mapycz/mapnik,naturalatlas/mapnik,tomhughes/mapnik,CartoDB/mapnik,mapnik/mapnik,mapnik/mapnik,zerebubuth/mapnik,lightmare/mapnik,pnorman/mapnik,mapnik/mapnik,tomhughes/mapnik,lightmare/mapnik,lightmare/mapnik,mapycz/mapnik,naturalatlas/mapnik,mapycz/mapnik,zerebubuth/mapnik,tomhughes/mapnik,CartoDB/mapnik,mapnik/mapnik,pnorman/mapnik