debug.py: _test_db_api and _get_dataset_structure were already async def
but called SupersetClient methods (authenticate, get_databases, get_dataset)
without await. Added await to 4 calls.
task_logger.py: _add_log callback is async def but _log() called it without
await, silently dropping all task log messages (RuntimeWarning: coroutine
never awaited). Changed to fire-and-forget via asyncio.ensure_future when
a running event loop is available, drops gracefully otherwise.
busya
250b69db8c