If a provided file_path does not exist, throw an exception early.
If a provided file_path does not exist, throw an exception early.


git-svn-id: 353d90d4d8d13dcb4e0402680a9155a727f61a5a@1090619 13f79535-47bb-0310-9956-ffa450edef68

apache/libcloud,jerryblakley/libcloud,JamesGuthrie/libcloud,supertom/libcloud,StackPointCloud/libcloud,briancurtin/libcloud,pquentin/libcloud,erjohnso/libcloud,Itxaka/libcloud,munkiat/libcloud,Scalr/libcloud,kater169/libcloud,techhat/libcloud,pantheon-systems/libcloud,mbrukman/libcloud,sergiorua/libcloud,SecurityCompass/libcloud,Cloud-Elasticity-Services/as-libcloud,ClusterHQ/libcloud,wido/libcloud,niteoweb/libcloud,supertom/libcloud,thesquelched/libcloud,sergiorua/libcloud,cloudControl/libcloud,cryptickp/libcloud,wido/libcloud,jerryblakley/libcloud,MrBasset/libcloud,ninefold/libcloud,vongazman/libcloud,cryptickp/libcloud,atsaki/libcloud,MrBasset/libcloud,Scalr/libcloud,pquentin/libcloud,mgogoulos/libcloud,dcorbacho/libcloud,erjohnso/libcloud,jimbobhickville/libcloud,Itxaka/libcloud,mgogoulos/libcloud,DimensionDataCBUSydney/libcloud,sahildua2305/libcloud,sfriesel/libcloud,DimensionDataCBUSydney/libcloud,aleGpereira/libcloud,wrigri/libcloud,cloudControl/libcloud,iPlantCollaborativeOpenSource/libcloud,mtekel/libcloud,ClusterHQ/libcloud,marcinzaremba/libcloud,aviweit/libcloud,Kami/libcloud,mtekel/libcloud,Cloud-Elasticity-Services/as-libcloud,DimensionDataCBUSydney/libcloud,NexusIS/libcloud,illfelder/libcloud,jimbobhickville/libcloud,niteoweb/libcloud,sfriesel/libcloud,samuelchong/libcloud,mbrukman/libcloud,Kami/libcloud,curoverse/libcloud,niteoweb/libcloud,ByteInternet/libcloud,wuyuewen/libcloud,JamesGuthrie/libcloud,iPlantCollaborativeOpenSource/libcloud,t-tran/libcloud,vongazman/libcloud,schaubl/libcloud,sgammon/libcloud,ZuluPro/libcloud,smaffulli/libcloud,atsaki/libcloud,munkiat/libcloud,StackPointCloud/libcloud,lochiiconnectivity/libcloud,pantheon-systems/libcloud,lochiiconnectivity/libcloud,mtekel/libcloud,jerryblakley/libcloud,wrigri/libcloud,dcorbacho/libcloud,SecurityCompass/libcloud,iPlantCollaborativeOpenSource/libcloud,watermelo/libcloud,samuelchong/libcloud,aviweit/libcloud,supertom/libcloud,andrewsomething/libcloud,mgogoulos/libcloud,marcinzaremba/libcloud,StackPointCloud/libcloud,carletes/libcloud,aleGpereira/libcloud,sahildua2305/libcloud,Jc2k/libcloud,illfelder/libcloud,jimbobhickville/libcloud,Jc2k/libcloud,lochiiconnectivity/libcloud,ZuluPro/libcloud,mbrukman/libcloud,kater169/libcloud,curoverse/libcloud,wuyuewen/libcloud,Verizon/libcloud,thesquelched/libcloud,dcorbacho/libcloud,schaubl/libcloud,andrewsomething/libcloud,techhat/libcloud,watermelo/libcloud,munkiat/libcloud,NexusIS/libcloud,wrigri/libcloud,Scalr/libcloud,aleGpereira/libcloud,ninefold/libcloud,Kami/libcloud,pquentin/libcloud,wuyuewen/libcloud,NexusIS/libcloud,Keisuke69/libcloud,ByteInternet/libcloud,andrewsomething/libcloud,JamesGuthrie/libcloud,techhat/libcloud,sahildua2305/libcloud,carletes/libcloud,mistio/libcloud,Verizon/libcloud,atsaki/libcloud,wido/libcloud,samuelchong/libcloud,t-tran/libcloud,briancurtin/libcloud,sergiorua/libcloud,SecurityCompass/libcloud,kater169/libcloud,thesquelched/libcloud,Keisuke69/libcloud,mistio/libcloud,ZuluPro/libcloud,apache/libcloud,schaubl/libcloud,cryptickp/libcloud,pantheon-systems/libcloud,mistio/libcloud,sfriesel/libcloud,smaffulli/libcloud,apache/libcloud,mathspace/libcloud,mathspace/libcloud,cloudControl/libcloud,marcinzaremba/libcloud,Cloud-Elasticity-Services/as-libcloud,vongazman/libcloud,mathspace/libcloud,aviweit/libcloud,smaffulli/libcloud,t-tran/libcloud,curoverse/libcloud,Itxaka/libcloud,illfelder/libcloud,erjohnso/libcloud,watermelo/libcloud,briancurtin/libcloud,sgammon/libcloud,ByteInternet/libcloud,MrBasset/libcloud,carletes/libcloud,Verizon/libcloud