return empty list in get_open_files() for PID 0 on Linux
return empty list in get_open_files() for PID 0 on Linux

google-code-export/psutil,kiranvizru/psutil,djhaskin987/psutil,chjwang/psutil,creativewild/psutil,anfedorov/psutil,google-code-export/psutil,vmolsa/psutil,zhengzheng/psutil,huson2012/psutil,google-code-export/psutil,anfedorov/psutil,google-code-export/psutil,huson2012/psutil,Alwnikrotikz/psutil,huson2012/psutil,tigerneil/psutil,djhaskin987/psutil,creativewild/psutil,marmolu/psutil,vmolsa/psutil,djhaskin987/psutil,kiranvizru/psutil,end18/psutil,skyshe/psutil,AlanZatarain/psutil,vmolsa/psutil,creativewild/psutil,tigerneil/psutil,marmolu/psutil,jucapj/psutil,jucapj/psutil,end18/psutil,skyshe/psutil,tigerneil/psutil,stupidcache/psutil,zhengzheng/psutil,AlanZatarain/psutil,nmani1905/psutil,PFZheng/psutil,kiranvizru/psutil,PFZheng/psutil,skyshe/psutil,stupidcache/psutil,vmolsa/psutil,tigerneil/psutil,shiva21/psutil,djhaskin987/psutil,nmani1905/psutil,stupidcache/psutil,peter-hst/psutil,end18/psutil,end18/psutil,kiranvizru/psutil,skyshe/psutil,chjwang/psutil,shiva21/psutil,peter-hst/psutil,Alwnikrotikz/psutil