Fix cython -v error when no source files given.
Fix cython -v error when no source files given.

Reported by gpk@kochanski.org

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