Adding an exception if we can't find a valid line for a source.
Adding an exception if we can't find a valid line for a source.

--HG--
extra : convert_revision : svn%3A3ed01bd8-26fb-0310-9e4c-ca1a4053419f/networkx/trunk%401346

RMKD/networkx,blublud/networkx,kai5263499/networkx,dhimmel/networkx,kernc/networkx,jcurbelo/networkx,ghdk/networkx,OrkoHunter/networkx,bzero/networkx,blublud/networkx,dmoliveira/networkx,aureooms/networkx,dmoliveira/networkx,ionanrozenfeld/networkx,debsankha/networkx,farhaanbukhsh/networkx,tmilicic/networkx,jakevdp/networkx,kernc/networkx,blublud/networkx,ionanrozenfeld/networkx,harlowja/networkx,nathania/networkx,kernc/networkx,yashu-seth/networkx,chrisnatali/networkx,nathania/networkx,dhimmel/networkx,farhaanbukhsh/networkx,jakevdp/networkx,kai5263499/networkx,farhaanbukhsh/networkx,sharifulgeo/networkx,jtorrents/networkx,jfinkels/networkx,bzero/networkx,dmoliveira/networkx,andnovar/networkx,SanketDG/networkx,beni55/networkx,NvanAdrichem/networkx,debsankha/networkx,ghdk/networkx,jni/networkx,chrisnatali/networkx,jakevdp/networkx,sharifulgeo/networkx,harlowja/networkx,JamesClough/networkx,aureooms/networkx,aureooms/networkx,chrisnatali/networkx,wasade/networkx,debsankha/networkx,ionanrozenfeld/networkx,nathania/networkx,Sixshaman/networkx,RMKD/networkx,dhimmel/networkx,sharifulgeo/networkx,RMKD/networkx,kai5263499/networkx,bzero/networkx,goulu/networkx,michaelpacer/networkx,ltiao/networkx,jni/networkx,jtorrents/networkx,cmtm/networkx,jni/networkx,harlowja/networkx,ghdk/networkx