This is causing a crash if self._application is used before the __init__ has finished (or at least passed the definition of self._application). That can happen in this class since some functions are called asynchronously.
It would also make writing tests easier because you can mock the getInstance() function to return a mock object, and only need to monkeypatch that for the function under test rather than also for the constructor.
Fixes Sentry issue CURA-1B5.
452fe3972f