Fixed exception on empty substring
Fixed exception on empty substring

happy-co/DTCoreText,sebreh/DTCoreText,gank0326/CoreTextWithHTML,Cocoanetics/DTCoreText,1yvT0s/DTCoreText,ibru/DTCoreText,bastianh/DTCoreText,wweiradio/DTCoreText,Cocoanetics/DTCoreText,gnr/DTCoreText,wlisac/DTCoreText,barz/DTCoreText,jogloran/DTCoreText,danielphillips/DTCoreText,z8927623/DTCoreText,artifacts/DTCoreText,Cocoanetics/DTCoreText,yifan/DTCoreText,esteluk/DTCoreText,iwakevin/DTCoreText,sujeking/DTCoreText,wangmb/DTCoreText,rain1988/DTCoreText,badoo/DTCoreText,jogloran/DTCoreText,iwakevin/DTCoreText,liuslevis/DTCoreText,youprofit/DTCoreText,davbeck/DTCoreText,rdougan/DTCoreText,hkg36/DTCoreText_amen_mod,rain1988/DTCoreText,openresearch/DTCoreText,cnbin/DTCoreText,shwetsolanki/DTCoreText,gsempe/DTCoreText,devontech/DTCoreText,gshaviv/DTCoreText,depl0y/DTCoreText,canyu9512/DTCoreText,holgersindbaek/DTCoreText,kemenaran/DTCoreText,wordnik/DTCoreText,appunite/DTCoreText,MSch/DTCoreText,MattKiazyk/DTCoreText,shuoshi/DTCoreText,AmberWhiteSky/DTCoreText,danielphillips/DTCoreText,thusfresh/DTCoreText,smartlogic/DTCoreText,DanGe42/DTCoreText,liulinjian/DTCoreText,MattKiazyk/DTCoreText,yifan/DTCoreText,zulip/DTCoreText,novi/DTCoreText,w2592583/DTCoreText,joepasq/DTCoreText,sidslog/DTCoreText,cnbin/DTCoreText,Akylas/DTCoreText,goodheart/DTCoreText,i-miss-you/DTCoreText,bnickel/DTCoreText,wlisac/DTCoreText,rgregg/DTCoreText,yaoxiaoyong/DTCoreText,mirego/DTCoreText,SanjoDeundiak/DTCoreText,hkg36/DTCoreText_amen_mod,niklassaers/DTCoreText,artifacts/DTCoreText,smartlogic/DTCoreText,shuoshi/DTCoreText,pegli/DTCoreText,wangmb/DTCoreText,CoderJWYang/DTCoreText,Akylas/DTCoreText,beingenious/DTCoreText,ricobeck/DTCoreText,niklassaers/DTCoreText,barz/DTCoreText,Esdeath/DTCoreText,AmberWhiteSky/DTCoreText,xiaoyanit/DTCoreText,artifacts/DTCoreText,siuying/DTCoreText,siuying/DTCoreText,DanGe42/DTCoreText,rgregg/DTCoreText,mirego/DTCoreText,kcoop/DTCoreText,siuying/DTCoreText,tonycn/DTCoreText,gamma/DTCoreText,wweiradio/DTCoreText,ipodishima/DTCoreText,bnickel/DTCoreText,brightec/DTCoreText,pivotaltracker/DTCoreText,qskycolor/DTCoreText,liulinjian/DTCoreText,ricobeck/DTCoreText,trispo/DTCoreText,ipodishima/DTCoreText,sujeking/DTCoreText,beingenious/DTCoreText,Torsph/DTCoreText,zulip/DTCoreText,pegli/DTCoreText,ibru/DTCoreText,beingenious/DTCoreText,jingchunYuan/DTCoreText,trispo/DTCoreText,benanderman/DTCoreText,wordnik/DTCoreText,depl0y/DTCoreText,kcoop/DTCoreText,appunite/DTCoreText,kemenaran/DTCoreText,jjamminjim/DTCoreText,jingchunYuan/DTCoreText,badoo/DTCoreText,danielphillips/DTCoreText,trispo/DTCoreText,gamma/DTCoreText,gsempe/DTCoreText,davbeck/DTCoreText,sbeigel/NSAttributedString-Additions-for-HTML,salzhrani/NSAttributedString-Additions-for-HTML,i-miss-you/DTCoreText,unisontech/DTCoreText,qskycolor/DTCoreText,unisontech/DTCoreText,artifacts/DTCoreText,yifan/DTCoreText,OliverLetterer/DTCoreText,bastianh/DTCoreText,programming086/DTCoreText,SanjoDeundiak/DTCoreText,z8927623/DTCoreText,1yvT0s/DTCoreText,rdougan/DTCoreText,joepasq/DTCoreText,pegli/DTCoreText,goodheart/DTCoreText,tonycn/DTCoreText,devontech/DTCoreText,OliverLetterer/DTCoreText,gank0326/CoreTextWithHTML,chbeer/NSAttributedString-Additions-for-HTML,brightec/DTCoreText,wordnik/DTCoreText,canyu9512/DTCoreText,rdougan/DTCoreText,wweiradio/DTCoreText,chbeer/NSAttributedString-Additions-for-HTML,benanderman/DTCoreText,thusfresh/DTCoreText