HUE-9116 [hive] Check if destination empty before export data to hdfs

Review Request #14706 — Created Jan. 9, 2020 and updated — Latest diff uploaded

yingc
hue
master
HUE-9116
johan, ranade, romain, weixia
commit f58482d40995fe2ffaf46bc601e863958648c0b2 (HEAD -> master, origin/ying-test6)
Author: Ying Chen <yingchen@cloudera.com>
Date:   Thu Jan 9 15:24:20 2020 -0800

    HUE-9116 [hive] Check if destination empty before export data to hdfs

:100644 100644 68b87468f5... 0d705c5d6a... M    desktop/libs/notebook/src/notebook/api.py
:100644 100644 33d2dd89bf... fdc75db0e6... M    desktop/libs/notebook/src/notebook/tests.py
added notebook.tests:TestNotebookApiMocked.test_export_result
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