Fix panic when renewing a github token from a previous version of Vault
Fix panic when renewing a github token from a previous version of Vault

mhurne/vault,michaelansel/vault,danielsomerfield/vault,cimarron-pistoncloud/vault,hashicorp/vault,lemondrank/vault,LolalyLuo/vault,kingland/vault,rnaveiras/vault,jmhardison/vault,hashicorp/vault,lemondrank/vault,wjam/vault,lirao/vault,chrishoffman/vault,hashicorp/vault,naunga/vault,jam-pot/vault,jmhardison/vault,rnaveiras/vault,memory/vault,Aloomaio/vault,mgk/vault,ryon/vault,Banno/vault,peteryhwong/vault,joelthompson/vault,wjam/vault,rnaveiras/vault,joelthompson/vault,martin-ducar-gd/vault,Aloomaio/vault,mymercurialsky/vault,rnaveiras/vault,jgcallero/vault,deverton/hashicorp-vault,hartsock/vault,mymercurialsky/vault,Caiyeon/vault,chrishoffman/vault,Banno/vault,quixoten/vault,jmhardison/vault,lirao/vault,joelthompson/vault,memory/vault,tallpauley/vault,hartsock/vault,kingland/vault,danielsomerfield/vault,kingland/vault,skippy/vault,cimarron-pistoncloud/vault,naunga/vault,LolalyLuo/vault,MonsantoCo/vault,MonsantoCo/vault,kingland/vault,mgk/vault,hartsock/vault,joelthompson/vault,michaelansel/vault,deverton/hashicorp-vault,hashicorp/vault,quixoten/vault,hartsock/vault,doodles526/vault,jmhardison/vault,quixoten/vault,ryon/vault,mgk/vault,jam-pot/vault,peteryhwong/vault,Caiyeon/vault,hashicorp/vault,Aloomaio/vault,hartsock/vault,rnaveiras/vault,doodles526/vault,quixoten/vault,jmhardison/vault,tallpauley/vault,jgcallero/vault,skippy/vault,hashicorp/vault,kingland/vault,martin-ducar-gd/vault,Aloomaio/vault,mgk/vault,mhurne/vault