https://github.com/cloudera/hue/pull/382
@@ -263,7 +263,7 @@ class SparkApi(Api):
elif content['status'] == 'error':
tb = content.get('traceback', None)
- if tb is None:
+ if tb is None or not tb:
msg = content.get('ename', 'unknown error')
evalue = content.get('evalue')