Fixed C++ exception handling for indexing when it is not used for assignment.
Fixed C++ exception handling for indexing when it is not used for
assignment.

mcanthony/cython,fabianrost84/cython,mcanthony/cython,da-woods/cython,scoder/cython,c-blake/cython,mcanthony/cython,hhsprings/cython,da-woods/cython,fperez/cython,scoder/cython,acrispin/cython,ChristopherHogan/cython,ChristopherHogan/cython,acrispin/cython,fabianrost84/cython,scoder/cython,mrGeen/cython,hhsprings/cython,hhsprings/cython,fabianrost84/cython,acrispin/cython,ChristopherHogan/cython,hickford/cython,acrispin/cython,fperez/cython,acrispin/cython,mrGeen/cython,cython/cython,fabianrost84/cython,mrGeen/cython,fperez/cython,cython/cython,scoder/cython,mcanthony/cython,cython/cython,c-blake/cython,c-blake/cython,hickford/cython,hickford/cython,hickford/cython,cython/cython,fabianrost84/cython,mcanthony/cython,mrGeen/cython,fperez/cython,c-blake/cython,c-blake/cython,mrGeen/cython,fperez/cython,da-woods/cython,da-woods/cython,hhsprings/cython,hhsprings/cython,hickford/cython