AttributeError: 'TotalStatistics' object has no attribute 'all'

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Issue found not able to move ahead.

```
(Robot) C:\Users\Rahul.Mangal>python -m dbbot.run E:/routput.xml
Traceback (most recent call last):
File "C:\Users\Rahul.Mangal\.conda\envs\Robot\lib\runpy.py", line 174, in _run_module_as_main
"__main__", fname, loader, pkg_name)
File "C:\Users\Rahul.Mangal\.conda\envs\Robot\lib\runpy.py", line 72, in _run_code
exec code in run_globals
File "C:\Users\Rahul.Mangal\.conda\envs\Robot\lib\site-packages\dbbot\run.py", line 51, in
DbBot().run()
File "C:\Users\Rahul.Mangal\.conda\envs\Robot\lib\site-packages\dbbot\run.py", line 41, in run
self._parser.xml_to_db(xml_file)
File "C:\Users\Rahul.Mangal\.conda\envs\Robot\lib\site-packages\dbbot\reader\robot_results_parser.py", line 51, in xml_to_db
self._parse_suite(test_run.suite, test_run_id)
File "C:\Users\Rahul.Mangal\.conda\envs\Robot\lib\site-packages\dbbot\reader\robot_results_parser.py", line 116, in _parse_suite
self._parse_suite_status(test_run_id, suite_id, suite)
File "C:\Users\Rahul.Mangal\.conda\envs\Robot\lib\site-packages\dbbot\reader\robot_results_parser.py", line 125, in _parse_suite_status
'passed': suite.statistics.all.passed,
AttributeError: 'TotalStatistics' object has no attribute 'all'
```

Start in dbbot/reader/robot_results_parser.py, especially _parse_suite_status, reached through dbbot.run and DbBot().run(). Reproduce with the reported E:/routput.xml input, then verify that parsing completes without the TotalStatistics attribute error and that the results are written to the SQLite database.

Written by the indexing model from the issue text.