Guard the chmod in case external_attr is 0.
Guard the chmod in case external_attr is 0.

Carreau/pip,cjerdonek/pip,minrk/pip,tdsmith/pip,RonnyPfannschmidt/pip,ChristopherHogan/pip,erikrose/pip,natefoo/pip,prasaianooz/pip,atdaemon/pip,pjdelport/pip,fiber-space/pip,chaoallsome/pip,tdsmith/pip,davidovich/pip,habnabit/pip,qwcode/pip,sbidoul/pip,natefoo/pip,caosmo/pip,techtonik/pip,Gabriel439/pip,squidsoup/pip,esc/pip,KarelJakubec/pip,minrk/pip,qwcode/pip,supriyantomaftuh/pip,xavfernandez/pip,RonnyPfannschmidt/pip,blarghmatey/pip,chaoallsome/pip,techtonik/pip,mujiansu/pip,ChristopherHogan/pip,luzfcb/pip,alex/pip,prasaianooz/pip,RonnyPfannschmidt/pip,qbdsoft/pip,cjerdonek/pip,blarghmatey/pip,tdsmith/pip,Ivoz/pip,ianw/pip,mindw/pip,erikrose/pip,caosmo/pip,zenlambda/pip,blarghmatey/pip,h4ck3rm1k3/pip,habnabit/pip,jasonkying/pip,qbdsoft/pip,rbtcollins/pip,alquerci/pip,pypa/pip,zenlambda/pip,harrisonfeng/pip,mattrobenolt/pip,ncoghlan/pip,mujiansu/pip,mindw/pip,jythontools/pip,wkeyword/pip,erikrose/pip,patricklaw/pip,rbtcollins/pip,yati-sagade/pip,esc/pip,benesch/pip,haridsv/pip,nthall/pip,ChristopherHogan/pip,zvezdan/pip,willingc/pip,habnabit/pip,willingc/pip,pypa/pip,Gabriel439/pip,pfmoore/pip,davidovich/pip,KarelJakubec/pip,zvezdan/pip,fiber-space/pip,graingert/pip,rbtcollins/pip,zenlambda/pip,pjdelport/pip,esc/pip,pradyunsg/pip,ianw/pip,Gabriel439/pip,davidovich/pip,alex/pip,nthall/pip,ncoghlan/pip,rouge8/pip,haridsv/pip,zorosteven/pip,supriyantomaftuh/pip,haridsv/pip,h4ck3rm1k3/pip,xavfernandez/pip,graingert/pip,willingc/pip,techtonik/pip,alquerci/pip,jythontools/pip,fiber-space/pip,jasonkying/pip,prasaianooz/pip,dstufft/pip,jamezpolley/pip,yati-sagade/pip,supriyantomaftuh/pip,natefoo/pip,wkeyword/pip,jmagnusson/pip,msabramo/pip,xavfernandez/pip,squidsoup/pip,jmagnusson/pip,qbdsoft/pip,jamezpolley/pip,luzfcb/pip,mindw/pip,jmagnusson/pip,benesch/pip,sigmavirus24/pip,harrisonfeng/pip,benesch/pip,dstufft/pip,harrisonfeng/pip,pradyunsg/pip,pfmoore/pip,jythontools/pip,rouge8/pip,caosmo/pip,zvezdan/pip,sbidoul/pip,KarelJakubec/pip,dstufft/pip,graingert/pip,zorosteven/pip,sigmavirus24/pip,h4ck3rm1k3/pip,luzfcb/pip,Ivoz/pip,Carreau/pip,zorosteven/pip,sigmavirus24/pip,James-Firth/pip,rouge8/pip,atdaemon/pip,squidsoup/pip,ncoghlan/pip,James-Firth/pip,pjdelport/pip,patricklaw/pip,James-Firth/pip,yati-sagade/pip,mattrobenolt/pip,nthall/pip,mujiansu/pip,atdaemon/pip,jamezpolley/pip,jasonkying/pip,chaoallsome/pip,msabramo/pip,alex/pip,wkeyword/pip