Fixed NPE if TestNG is invoked with no test classes.
Fixed NPE if TestNG is invoked with no test classes.

6ft-invsbl-rbbt/testng,rschmitt/testng,JeshRJ/myRepRJ,akozlova/testng,rschmitt/testng,msebire/testng,tremes/testng,jaypal/testng,juherr/testng,aledsage/testng,bmlct/testng,meeroslaph/testng,AJ-72/testng,scr/testng,akozlova/testng,gjuillot/testng,jerome-jacob/testng,scr/testng,tremes/testng,meeroslaph/testng,raindev/testng,raindev/testng,emopers/testng,gjuillot/testng,jerome-jacob/testng,emopers/testng,rschmitt/testng,raindev/testng,krmahadevan/testng,VladRassokhin/testng,msebire/testng,emopers/testng,msebire/testng,jerome-jacob/testng,AJ-72/testng,krmahadevan/testng,cbeust/testng,scr/testng,s2oBCN/testng,aledsage/testng,meeroslaph/testng,6ft-invsbl-rbbt/testng,meeroslaph/testng,juherr/testng,krmahadevan/testng,akozlova/testng,tobecrazy/testng,tobecrazy/testng,akozlova/testng,tobecrazy/testng,cbeust/testng,jaypal/testng,msebire/testng,aledsage/testng,gjuillot/testng,akozlova/testng,bmlct/testng,VikingDen/testng,AJ-72/testng,missedone/testng,6ft-invsbl-rbbt/testng,juherr/testng,smaudet/testng,bmlct/testng,AJ-72/testng,VikingDen/testng,jaypal/testng,missedone/testng,missedone/testng,VladRassokhin/testng,meeroslaph/testng,jaypal/testng,s2oBCN/testng,scr/testng,smaudet/testng,cbeust/testng,s2oBCN/testng,missedone/testng,VladRassokhin/testng,raindev/testng,msebire/testng,jerome-jacob/testng,smaudet/testng,scr/testng,aledsage/testng,rschmitt/testng,s2oBCN/testng,gjuillot/testng,JeshRJ/myRepRJ,VladRassokhin/testng,s2oBCN/testng,gjuillot/testng,jaypal/testng,VikingDen/testng,JeshRJ/myRepRJ,juherr/testng,aledsage/testng,AJ-72/testng,VladRassokhin/testng,JeshRJ/myRepRJ,jerome-jacob/testng,tremes/testng,JeshRJ/myRepRJ,smaudet/testng,raindev/testng,6ft-invsbl-rbbt/testng,cbeust/testng,VikingDen/testng,bmlct/testng,raindev/testng,emopers/testng,VladRassokhin/testng,missedone/testng,bmlct/testng,krmahadevan/testng,tobecrazy/testng,rschmitt/testng,aledsage/testng,emopers/testng,cbeust/testng,tobecrazy/testng,smaudet/testng,tremes/testng,6ft-invsbl-rbbt/testng,tremes/testng,VikingDen/testng,juherr/testng,AJ-72/testng,krmahadevan/testng