Fix twosigma/beaker-notebook#684, handle truncated gist
Fix twosigma/beaker-notebook#684, handle truncated gist

franblas/beaker-sharing-server,twosigma/beaker-sharing-server,franblas/beaker-sharing-server,twosigma/beaker-sharing-server,twosigma/beaker-sharing-server,franblas/beaker-sharing-server,twosigma/beaker-sharing-server,franblas/beaker-sharing-server