don't 500 on cell execution errors #186
Merged
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Sometimes, code execution will error (for example, missing dependencies), and it's rough to get 500 errors in the browser and have to look in the console where the server was started to see what the error was. This code leaves in-place the error presented in the notebook when executing that particular cell, and continues to log in on the server-side, but without causing a server 500 error.