Fix crash in xcodebuild_shim when IDEActivityLogSection.commandDetailDescription is nil.
Fix crash in xcodebuild_shim when IDEActivityLogSection.commandDetailDescription is nil.

Richardlihui/xctool,modulexcite/xctool,adamjernst/xctool,leopardpan/xctool,kernandreas/xctool,dvor/xctool,githubdelegate/xctool,duk42111/xctool,yaoxiaoyong/xctool,Richardlihui/xctool,LegNeato/xctool,yaoxiaoyong/xctool,adamjernst/xctool,dvor/xctool,modulexcite/xctool,theiren46/xctool,jspahrsummers/xctool,SuPair/xctool,agreco/xctool,AutoScout24/xctool,jspahrsummers/xctool,agreco/xctool,dvor/xctool,facebook/xctool,1yvT0s/xctool,leopardpan/xctool,ekingo/xctool,facebook/xctool,Monits/xctool,FiftyThree/xctool,kamoljan/xctool,SuPair/xctool,agreco/xctool,facebook/xctool,blighli/xctool,kamoljan/xctool,kernandreas/xctool,kernandreas/xctool,facebook/xctool,kernandreas/xctool,kamoljan/xctool,1yvT0s/xctool,leopardpan/xctool,trello/xctool,ekingo/xctool,LegNeato/xctool,Monits/xctool,jspahrsummers/xctool,PSPDFKit-labs/xctool,1yvT0s/xctool,duk42111/xctool,blighli/xctool,trello/xctool,PSPDFKit-labs/xctool,leopardpan/xctool,blighli/xctool,facebook/xctool,LegNeato/xctool,blighli/xctool,ekingo/xctool,SuPair/xctool,githubdelegate/xctool,trello/xctool,FiftyThree/xctool,Richardlihui/xctool,FiftyThree/xctool,yaoxiaoyong/xctool,PSPDFKit-labs/xctool,adamjernst/xctool,adamjernst/xctool,AutoScout24/xctool,AutoScout24/xctool,PSPDFKit-labs/xctool,theiren46/xctool,jspahrsummers/xctool,dvor/xctool,duk42111/xctool,Monits/xctool,theiren46/xctool,githubdelegate/xctool,theiren46/xctool,AutoScout24/xctool,LegNeato/xctool,ekingo/xctool,githubdelegate/xctool,facebook/xctool,SuPair/xctool,Monits/xctool,yaoxiaoyong/xctool,duk42111/xctool,modulexcite/xctool,agreco/xctool,Richardlihui/xctool,FiftyThree/xctool,kamoljan/xctool,trello/xctool,PSPDFKit-labs/xctool,1yvT0s/xctool,modulexcite/xctool