fixing obf when $ONOS_TAR doesnt exist
fixing obf when $ONOS_TAR doesnt exist

Change-Id: I5612024438de251fa689cb3333d7efe76423e3f0

sdnwiselab/onos,kuujo/onos,opennetworkinglab/onos,LorenzReinhart/ONOSnew,maheshraju-Huawei/actn,y-higuchi/onos,mengmoya/onos,osinstom/onos,VinodKumarS-Huawei/ietf96yang,sdnwiselab/onos,VinodKumarS-Huawei/ietf96yang,y-higuchi/onos,osinstom/onos,donNewtonAlpha/onos,opennetworkinglab/onos,mengmoya/onos,donNewtonAlpha/onos,kuujo/onos,donNewtonAlpha/onos,Shashikanth-Huawei/bmp,gkatsikas/onos,VinodKumarS-Huawei/ietf96yang,kuujo/onos,LorenzReinhart/ONOSnew,sdnwiselab/onos,kuujo/onos,maheshraju-Huawei/actn,osinstom/onos,kuujo/onos,maheshraju-Huawei/actn,sdnwiselab/onos,mengmoya/onos,gkatsikas/onos,VinodKumarS-Huawei/ietf96yang,LorenzReinhart/ONOSnew,Shashikanth-Huawei/bmp,oplinkoms/onos,opennetworkinglab/onos,LorenzReinhart/ONOSnew,Shashikanth-Huawei/bmp,kuujo/onos,oplinkoms/onos,maheshraju-Huawei/actn,y-higuchi/onos,osinstom/onos,gkatsikas/onos,oplinkoms/onos,mengmoya/onos,kuujo/onos,oplinkoms/onos,sdnwiselab/onos,osinstom/onos,sdnwiselab/onos,opennetworkinglab/onos,maheshraju-Huawei/actn,gkatsikas/onos,donNewtonAlpha/onos,y-higuchi/onos,opennetworkinglab/onos,y-higuchi/onos,opennetworkinglab/onos,Shashikanth-Huawei/bmp,Shashikanth-Huawei/bmp,VinodKumarS-Huawei/ietf96yang,oplinkoms/onos,gkatsikas/onos,oplinkoms/onos,LorenzReinhart/ONOSnew,mengmoya/onos,oplinkoms/onos,gkatsikas/onos,donNewtonAlpha/onos