avoid useless lookup of unknown encoding (fixes compiler crash)
avoid useless lookup of unknown encoding (fixes compiler crash)

--HG--
extra : transplant_source : %D5%D9Izb%7F%E6%AF%91%9A2j%25%FC%27%85%7CFs5

da-woods/cython,scoder/cython,andreasvc/cython,ChristopherHogan/cython,dahebolangkuan/cython,slonik-az/cython,dahebolangkuan/cython,c-blake/cython,cython/cython,scoder/cython,cython/cython,madjar/cython,hhsprings/cython,fabianrost84/cython,hhsprings/cython,hickford/cython,fperez/cython,roxyboy/cython,marscher/cython,mcanthony/cython,mrGeen/cython,marscher/cython,marscher/cython,ChristopherHogan/cython,madjar/cython,acrispin/cython,hickford/cython,scoder/cython,achernet/cython,slonik-az/cython,acrispin/cython,c-blake/cython,encukou/cython,acrispin/cython,slonik-az/cython,andreasvc/cython,JelleZijlstra/cython,ABcDexter/cython,achernet/cython,c-blake/cython,mrGeen/cython,hickford/cython,madjar/cython,achernet/cython,fabianrost84/cython,mcanthony/cython,andreasvc/cython,slonik-az/cython,roxyboy/cython,fperez/cython,encukou/cython,da-woods/cython,achernet/cython,dahebolangkuan/cython,madjar/cython,da-woods/cython,fperez/cython,c-blake/cython,ABcDexter/cython,mcanthony/cython,fabianrost84/cython,encukou/cython,fperez/cython,mcanthony/cython,roxyboy/cython,ABcDexter/cython,hhsprings/cython,cython/cython,mrGeen/cython,da-woods/cython,achernet/cython,ABcDexter/cython,c-blake/cython,scoder/cython,mrGeen/cython,hhsprings/cython,JelleZijlstra/cython,JelleZijlstra/cython,slonik-az/cython,cython/cython,ChristopherHogan/cython,fabianrost84/cython,hickford/cython,marscher/cython,encukou/cython,fabianrost84/cython,ABcDexter/cython,mcanthony/cython,roxyboy/cython,fperez/cython,roxyboy/cython,encukou/cython,marscher/cython,JelleZijlstra/cython,andreasvc/cython,acrispin/cython,acrispin/cython,madjar/cython,hickford/cython,mrGeen/cython,hhsprings/cython,JelleZijlstra/cython,andreasvc/cython,dahebolangkuan/cython,dahebolangkuan/cython