catch memcache errors
catch memcache errors

thomasyu888/nbviewer,twosigma/beaker-sharing-server,imsparsh/nbviewer,franblas/beaker-sharing-server,franblas/beaker-sharing-server,iamjakob/nbviewer,bollwyvl/nbviewer,christophelec/nbviewer,Sage-Bionetworks/nbviewer,roxyboy/nbviewer,Sage-Bionetworks/nbviewer,thomasyu888/nbviewer,twosigma/beaker-sharing-server,roxyboy/nbviewer,AlfiyaZi/nbviewer,Jay-Oh-eN/nbviewer,twosigma/beaker-sharing-server,franblas/beaker-sharing-server,imsparsh/nbviewer,bollwyvl/nbviewer,AlfiyaZi/nbviewer,christophelec/nbviewer,twosigma/beaker-sharing-server,Jay-Oh-eN/nbviewer,franblas/beaker-sharing-server,iamjakob/nbviewer