Handle execution errors with empty traceback entries similar to Lab #126
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This is a port of jupyter/notebook#6466 to
nbclassic
due to release management timelines. Please refer to that PR for details and screenshots. In a nutshell, this pull request makes the rendering of errors returned from execution requests like that of Jupyter Lab such that error payloads with empty tracebacks, but non-empty error name and value entries, will display the error.