fix error handling in optimised float adding code
fix error handling in optimised float adding code

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