Re-added try/except around src_prefix
Re-added try/except around src_prefix

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