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@@ -263,7 +263,7 @@ class SparkApi(Api):
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elif content['status'] == 'error':
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elif content['status'] == 'error':
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tb = content.get('traceback', None)
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tb = content.get('traceback', None)
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- if tb is None:
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+ if tb is None or not tb:
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msg = content.get('ename', 'unknown error')
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msg = content.get('ename', 'unknown error')
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evalue = content.get('evalue')
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evalue = content.get('evalue')
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