Added missing check for nil value sent to enumeration block.
Added missing check for nil value sent to enumeration block.

yaoxiaoyong/DTCoreText,depl0y/DTCoreText,zulip/DTCoreText,CoderJWYang/DTCoreText,gsempe/DTCoreText,DanGe42/DTCoreText,liuslevis/DTCoreText,thusfresh/DTCoreText,shuoshi/DTCoreText,wlisac/DTCoreText,esteluk/DTCoreText,sujeking/DTCoreText,mirego/DTCoreText,i-miss-you/DTCoreText,youprofit/DTCoreText,niklassaers/DTCoreText,qskycolor/DTCoreText,unisontech/DTCoreText,Torsph/DTCoreText,Akylas/DTCoreText,jingchunYuan/DTCoreText,holgersindbaek/DTCoreText,artifacts/DTCoreText,appunite/DTCoreText,jjamminjim/DTCoreText,artifacts/DTCoreText,gank0326/CoreTextWithHTML,goodheart/DTCoreText,appunite/DTCoreText,i-miss-you/DTCoreText,liulinjian/DTCoreText,ricobeck/DTCoreText,cnbin/DTCoreText,wangmb/DTCoreText,zulip/DTCoreText,rgregg/DTCoreText,Cocoanetics/DTCoreText,wangmb/DTCoreText,bnickel/DTCoreText,1yvT0s/DTCoreText,z8927623/DTCoreText,wweiradio/DTCoreText,wweiradio/DTCoreText,xiaoyanit/DTCoreText,barz/DTCoreText,DanGe42/DTCoreText,AmberWhiteSky/DTCoreText,Cocoanetics/DTCoreText,cnbin/DTCoreText,Akylas/DTCoreText,rain1988/DTCoreText,rgregg/DTCoreText,gnr/DTCoreText,thusfresh/DTCoreText,shuoshi/DTCoreText,Cocoanetics/DTCoreText,sidslog/DTCoreText,w2592583/DTCoreText,pivotaltracker/DTCoreText,z8927623/DTCoreText,1yvT0s/DTCoreText,davbeck/DTCoreText,gank0326/CoreTextWithHTML,liulinjian/DTCoreText,SanjoDeundiak/DTCoreText,barz/DTCoreText,ricobeck/DTCoreText,wweiradio/DTCoreText,davbeck/DTCoreText,gsempe/DTCoreText,artifacts/DTCoreText,wlisac/DTCoreText,AmberWhiteSky/DTCoreText,Esdeath/DTCoreText,canyu9512/DTCoreText,iwakevin/DTCoreText,jingchunYuan/DTCoreText,iwakevin/DTCoreText,sujeking/DTCoreText,niklassaers/DTCoreText,rain1988/DTCoreText,canyu9512/DTCoreText,openresearch/DTCoreText,goodheart/DTCoreText,artifacts/DTCoreText,SanjoDeundiak/DTCoreText,bnickel/DTCoreText,devontech/DTCoreText,depl0y/DTCoreText,mirego/DTCoreText,programming086/DTCoreText,devontech/DTCoreText,qskycolor/DTCoreText,unisontech/DTCoreText