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### _Why are the changes needed?_
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1 use isEmpty instead show for the init SQLs
2 add job desc for SQL tab of Spark UI
3 make it simple.
### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible
- [ ] Add screenshots for manual tests if appropriate
- [x] [Run test](https://kyuubi.readthedocs.io/en/latest/develop_tools/testing.html#running-tests) locally before make a pull request
Closes#914 from yaooqinn/isempty.
Closes#914
70785da7 [Kent Yao] Use isEmpty to trigger default init queries
438009e4 [Kent Yao] Use isEmpty to trigger default init queries
Authored-by: Kent Yao <yao@apache.org>
Signed-off-by: Kent Yao <yao@apache.org>
6dd8dfb70c