Fixes a few potential setObject:forKey: nil exceptions.
Fixes a few potential setObject:forKey: nil exceptions.

Guicai-Li/TMCache,xhacker/PINCache,pinterest/PINCache,ramoslin02/TMCache,klevison/PINCache,jaredsinclair/PINCache,pinterest/PINCache,tumblr/TMCache,ericzhou2008/TMCache,TimorCan/PINCache,Suninus/TMCache,paulkite/TMCache,libiao88/TMCache,yimouleng/TMCache,msdgwzhy6/TMCache,TimorCan/PINCache,gshaviv/TMCache,tumblr/TMCache,yimouleng/TMCache,lydonchandra/PINCache,loconsolutions/PINCache,Pingco/PINCache,gshaviv/TMCache,quanquan1986/TMCache,lydonchandra/PINCache,ondev/TMCache,loconsolutions/PINCache,ondev/TMCache,0x73/TMCache,rewcraig/PINCache,prrane/TMCache,msdgwzhy6/TMCache,loconsolutions/PINCache,xhacker/PINCache,quanquan1986/TMCache,jaredsinclair/PINCache,0x73/TMCache,paulkite/TMCache,nguyehuuphuc08/TMCache,ramoslin02/TMCache,nguyehuuphuc08/PINCache,libiao88/TMCache,rewcraig/PINCache,Pingco/PINCache,prrane/TMCache,rewcraig/PINCache,nguyehuuphuc08/PINCache,XZwalk/TMCache,normalcoder/PINCache,klevison/PINCache,Guicai-Li/TMCache,TimorCan/PINCache,xhacker/PINCache,normalcoder/PINCache,nguyehuuphuc08/PINCache,ericzhou2008/TMCache,pinterest/PINCache,XZwalk/TMCache,jaredsinclair/PINCache,nguyehuuphuc08/TMCache,Suninus/TMCache,lydonchandra/PINCache,Pingco/PINCache,klevison/PINCache,normalcoder/PINCache,pinterest/PINCache