Fix EditCommandTest tab character issue
Fix EditCommandTest tab character issue

kennyngdsc/addressbook-level4,Manish1Dahiya/main,kennyngdsc/addressbook-level4,lproperty/main,CS2103JAN2017-T15-B3/main,Manish1Dahiya/main,lproperty/main,CS2103JAN2017-T15-B3/main